Skip to main content

Filter By:

  • Show More Brands

  • Show Fewer Brands
  • Show More Sizes
  • Show Fewer Sizes

Helmets

$109.99
The M1 youth helmet is perfect for anything from racing to full days of uplifting or bike park laps. The M1 is the ideal helmet to keep you protected and comfortable. Features: - Youth helmet - Lightweight ABS Shell - 17 Vents provide cool air intake and heat exhaust - Large eye port for greater field or vision and improved goggle fit - Complies to CE, SPSC and AS Standards
$59.95 $120.00 50% Off
It's All in Your Tactic. With an unprecedented combination of fit, ventilation, and confidence for trail and enduro riding, the Tactic helmet delivers exceptional coverage and seamless integration with goggles or glasses. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - Tune a more precise, personalized fit thanks to Tactic's slim, incredibly adjustable Integrated Fit System that accommodates variations in head shape and occipital base. - Occipital base adjustment personalizes fit for comfort and allows you to tune helmet angle to ensure that your helmet and eyewear stay perfectly synched. - Integrated fixed visor provides increased trail vision and a seamless interface with eyewear. Specifically designed eyewear channels always give you a spot to store your glasses at a moment's notice. - Average weight: 380 grams (medium). - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet drawing heat away from the head. 4D brow cooling which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Whether your riding acoustic or e-MTB, the Tactic is certified to NTA 8776. - The Tactic earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Fitted with a MIPS Evolve solution. - Integrated fit system allows for extended (occipital) coverage. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor.
$89.99 $180.00 50% Off
Be so bold in the all-new Ambush 2. Fully redesigned from the buckle up with essential features for next-gen trail riding, the Ambush 2 channels ample ventilation through modern styling, with a superb fit and dialed eyewear integration. - Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - Sized to drop in with a highly customizable fit and precision adjustment. The Ambush 2 features our SBC Integrated Fit system and adjustable Tri-Fix splitters to provide a dialed fit. - Fine-tune your vision using the Ambush 2’s Occipital Base Adjustment to precisely adjust how the helmet sits on the brow for seamless integration with goggles and glasses for an unrestricted view down the trail. - Innovative sunglasses storage with hidden rubber flaps maintains a secure, rattle-free fit, keeping your glasses safely stored when you need to get them out of the way during long climbs or moments of rest. - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet, drawing heat away from the head. 4D brow cooling, which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Integrated fixed visor with a breakaway feature provides increased trail vision and a seamless interface with eyewear while effectively channeling airflow through the helmet for superb ventilation. - Strategically optimized dual-density EPS foam eliminates bulk and reduces excess weight. - The Ambush 2 earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Features the MIPS SL solution with our exclusive perforated backing. Integrating MIPS technology within the helmet padding reduces moisture retention while increasing breathability. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. - Average weight: 360 grams (medium).
$99.99
- Compass fit - 11 vents with increased air flow - Compatible with click-mount light - Lightweight - Integrated brim - Lay flat strap dividers - Compression molded pads - Light & durable dual shell - Snowsport knit compatible - Average weight: 390g(mips) - MIPS: multi-directional impact protection system
$50.00
Set your littlest riders on the path to two-wheeled freedom with the all-new Mio 2 helmet. Through an exclusive partnership with KTH Royal Institute of Technology (KTH) and Mips, we shared our helmet’s CAD designs and studied the malleable skulls of young children with Finite Element Analysis (FEA). Because toddler-aged children’s heads are softer and still growing, using low-density foam - and more of it - was the outcome of this partnership. DATA DRIVEN INNOVATION: Coming out of our KTH and Mips partnership, the Mio 2 had increased the amount of low-density foam inside by 16.5%, only growing the overall size of the helmet by 2.5%. COMFORT: The Mio 2 may have the latest and greatest technology inside, but that only matters when the helmet is worn properly. That’s why Mio 2 features specific toddler-oriented sizing and our SX headset fit system, to help it stay properly fitted and comfortable, whenever it is worn. The easy-to-use tri-fix web splitter makes getting a ‘fuss-free’ fit incredibly simple, all adding up to a helmet they’ll beg to wear. UNLEASH THEIR IMAGINATION: On the outside, the Mio 2 comes in energetic colors sure to inspire fun and creativity from adventure-hungry kids. The included sticker pack offers a retro vibe with a modern twist with bright graphics and lettering for even more personalization. After all, getting our young riders excited enough to want to wear their helmet every day is the number one goal. For helmets sold in the U.S. and Canada: Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 1 and Older. - Mips-equipped. - Headset SX fit system with toddler-oriented sizing that's designed for an easy and accurate fit. - In-molded shell improves strength and reduces weight. - Tri-Fix web splitter for improved comfort and ease of strap adjustments. - Reflective webbing and rear decal for increased visibility in low-light conditions. - 46-51 cm OSFM Toddler size, approximately up to age three. - Size: 18-20" / 46-51cm
$55.00
Sleek styling, cool graphics, and youth-oriented sizing make the Shuffle Child LED helmet the perfect choice for your kids—day or night. - MIPS-equipped. - Integrated LED tail light for increased visibility in in both bright and low-light conditions. - Headset SX fit system with child-oriented sizing that's designed for an easy and accurate fit. - 4th Dimension Cooling System to optimize ventilation. - In-molded shell improves strength and reduces weight. - Tri-Fix web splitter for improved comfort and ease of strap adjustments. - Reflective webbing for increased visibility in low-light conditions. - Stylish, youthful designs complement our bike graphics and colors. - Patented clip-on visor included.
$80.00
Ready for the trail. Designed for the fast descents and long technical climbs. This is the perfect helmet for committed trail riders and those wanting to explore beyond the beaten path. Where it thrives: Challenging trails, out in the elements What it's built for: Durability, comfort Highlights: - 13 air vents - Deep rear coverage - Adjustable angle visor
$110.00
It's All in Your Tactic. With an unprecedented combination of fit, ventilation, and confidence for trail and enduro riding, the Tactic helmet delivers exceptional coverage and seamless integration with goggles or glasses. - Tune a more precise, personalized fit thanks to Tactic's slim, incredibly adjustable Integrated Fit System that accommodates variations in head shape and occipital base. - Occipital base adjustment personalizes fit for comfort and allows you to tune helmet angle to ensure that your helmet and eyewear stay perfectly synched. - Integrated fixed visor provides increased trail vision and a seamless interface with eyewear. Specifically designed eyewear channels always give you a spot to store your glasses at a moment's notice. - 380 grams (medium) of lightweight performance. - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet drawing heat away from the head. 4D brow cooling, which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Whether you're riding acoustic or e-MTB, the Tactic passes the e-bike Standard NTA8776 so you can can send it with confidence on whatever bike choice you make. - The Tactic earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Fitted with a MIPS Evolve solution to provide 10 to 15 millimeters of rotation in every direction. - Integrated fit system allows for extended (occipital) coverage. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. Sizing: - Small = 51 – 56cm - Medium = 55 – 59cm - Large = 58 – 62cm
$120.00
Busy city streets and dim neighborhood roads, the Smith Express MIPS bike helmet is all-in when it's commuting time. The advanced angled impact protection of MIPS pairs with a clean, minimalist shape for a look that's cool and casual with the protection you want. Add the visor to help cut the glare, and adjust the fit with the turn of a dial. A pop-in rear light and reflective straps help boost visibility any time of day. PROTECTION: Lightweight in-mold construction, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head FIT / INTEGRATION: Adjustable dial fit for easy, on-the-go size adjustment FEATURES: 13 fixed vents for consistent airflow, Lightweight, low-bulk single layer webbing with reflective details, Removable fabric visor, Integrated removable rear vent light WEIGHT: (Size M, MIPS) 12oz / 330g CERTIFICATION: CPSC,CE EN 1078
$70.00
Bike path, grocery run, or downtown commute, the Smith Express helmet pairs a lightweight build with clean, minimalist style for everyday, around-town riding. Strategic vents keep the air flowing so you arrive at your destination feeling good. You can fine tune the fit with the turn of a dial, and reflective stitching on the chin straps helps boost visibility in low light. PROTECTION: Lightweight in-mold construction FIT / INTEGRATION: Adjustable dial fit for easy, on-the-go size adjustment FEATURES: 13 fixed vents for consistent airflow, Lightweight, low-bulk single layer webbing with reflective details WEIGHT: (Size M) 11oz / 300g CERTIFICATION: CPSC,CE EN 1078
$110.00
For mountain bikers looking for a stylish, great-fitting helmet, look no further than the new Venture. The Venture features extended coverage on the back of the head for additional protection, internal air channels and 20 vents to keep riders cool, and the VaporFit system makes for a secure and comfortable fit. - Lightweight in-mold construction - MIPS system in all colors - VaporFit adjustable fit system - 20 optimized vents - XT2 anti-bacterial performance lining - Ultra-light single layer webbing - AirEvac ventilation - Integrated visor - Weight (Size M, MIPS) 11.99oz / 340 grams - Certification: CPSC, CE EN 1078, AS/NZS2063 Sizing - Small: 51 – 55cm - Medium: 55 – 59cm – Large: 59 – 62cm
$110.00
For the everyday rider that is ready for a stylish helmet with a tailor-made fit, Smith is introducing the new Portal helmet. The adjustable VaporFit system provides a customized fit, while the MIPS liner adds an increased level of protection. The Portal features 18 optimally placed vents that work with internal air channels to keep you cool and comfortable. - Lightweight in-mold construction - MIPS system in all colors - VaporFit adjustable fit system - 18 optimized vents - XT2 anti-bacterial performance lining - Ultra-light single layer webbing - AirEvac ventilation - Weight (Size M, MIPS) 10.58oz / 300 grams - Certification: CPSC, CE EN 1078, AS/NZS2063 Sizing - Small: 51 – 55cm - Medium: 55 – 59cm – Large: 59 – 62cm
$85.00
The Signal helmet provides cyclists an exceptional custom fit and elevated protection wrapped in Smith's signature style. By integrating Smith's proven VaporFit fit system with a MIPS liner system - the Signal delivers a tailor-made fit for every rider across four unique shell sizes. The Signal's AirEvac ventilation system and engirneered eyewear storage delivers the ultimate integration you expect from a s Smith helmet - PROTECTION: Lightweight in-mold construction, MIPS system available in all colors - FIT: VaporFit adjustable fit system, 21 optimized vents, Performance comfort lining, Ultra-light single layer webbing - INTEGRATION: AirEvac ventilation, Ultimate eyewear integration - WEIGHT: (Size M, MIPS) 11oz / 300g - CERTIFICATION: CPSC, CE EN 1078, AS/NZS2063
$85.00
Cruising around the neighborhood or skill-building at the local bike park, the Smith Maze bike helmet keeps your look casual and sets a good example for your kiddo while you're at it. Through cool mornings or sunny afternoons, the lightweight build and two-vent front keeps you comfortable. Buckle up and show your kid what the wheelie gene looks like. PROTECTION: Lightweight in-mold construction FIT / INTEGRATION: Self-adjusting lifestyle fit system flexes to match your head shape for maximum comfort, AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses FEATURES: Two vents for airflow, Ionic+ antimicrobial lining offers sweat-activated odor control, Lightweight, low-bulk single layer webbing, WEIGHT: (Size M, MIPS) 10oz / 270g CERTIFICATION: CPSC, CE EN 1078
$70.00 - $85.00
The Convoy helmet provides mountain bikers an exceptional custom fit and elevated protection wrapped in Smith's signature style. By integrating Smith's proven VaporFit fit system with a MIPS liner system - the Signal delivers a tailor-made fit for every rider across four unique shell sizes. The Signal's AirEvac ventilation system and engirneered eyewear storage delivers the ultimate integration you expect from a s Smith helmet - PROTECTION: Lightweight in-mold construction, MIPS system available in all colors - FIT: VaporFit adjustable fit system, 21 optimized vents, Performance comfort lining, Ultra-light single layer webbing - INTEGRATION: AirEvac ventilation, Integrated visor, Ultimate eyewear integration - WEIGHT: (Size M, MIPS) 11oz / 300g - CERTIFICATION: CPSC, CE EN 1078, AS/NZS2063
$110.00
Big berms, rock gardens or flowy rollers. No matter the trail, get after it with confidence in the Smith Engage mountain bike helmet. MIPS Brain Protection System helps reduce angled impact forces in the event of a crash, while the VaporFit dial adjustment and extended back coverage provide a locked-in feel. On hot days or exposed climbs, 20 fixed vents and our AirEvac ventilation system keep you cool and comfortable. Channels on the front make it easy to stow eyewear and a two-position visor rotates up for on-the-go goggle storage. PROTECTION: Lightweight in-mold construction, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head. FIT / INTEGRATION: VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial, Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort, venting and storage convenience, AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses FEATURES: 21 fixed vents for consistent airflow, Two-position adjustable visor, Performance comfort lining, Lightweight, low-bulk single layer webbing WEIGHT: (Size M, MIPS) 12oz / 350g CERTIFICATION: CPSC, CE EN 1078 SIZING: - Small: 51 – 55cm - Medium: 55 – 59cm - Large: 59 – 62cm
$70.00
Get out, be seen. Sporty meets urban, a modern shape with ample air-vents is paired with the added safety of a rear light and reflective elements for visibility. Where it thrives: Leisurely rides, the open road What it's built for: Comfort, durability Highlights: - Rear safety light / reflective logos and straps - 19 air vents with front vent netting - One-handed adjustment for easy fitting
$120.00
It’s All in Your Tactic. With an unprecedented combination of fit, ventilation, and confidence for trail and enduro riding, the Tactic helmet delivers exceptional coverage and seamless integration with goggles or glasses. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - Tune a more precise, personalized fit thanks to Tactic’s slim, incredibly adjustable Integrated Fit System that accommodates variations in head shape and occipital base. - Occipital base adjustment personalizes fit for comfort and allows you to tune helmet angle to ensure that your helmet and eyewear stay perfectly synched. - Integrated fixed visor provides increased trail vision and a seamless interface with eyewear. Specifically designed eyewear channels always give you a spot to store your glasses at a moment’s notice. - Average weight: 380 grams (medium). - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet drawing heat away from the head. 4D brow cooling which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Whether you're riding acoustic or e-MTB, the Tactic is certified to NTA 8776. - The Tactic earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Fitted with a MIPS Evolve solution. - Integrated fit system allows for extended (occipital) coverage. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor.
$110.00
Fast-paced lunch ride or weekend 60-miler, the Smith Persist road helmet is down for whatever you've got in mind. Designed to feel like it's tailor-made for your head, it has an easy-to-adjust VaporFit system that lets you dial in the fit, even while riding. When you're sweating it out on the climb, 21 fixed vents and our AirEvac ventilation system keep the air flowing, your head cool and your glasses from fogging. MIPS Brain Protection System helps reduce angled impact forces in the event of a crash, for the confidence to tuck every descent. PROTECTION: Lightweight in-mold construction, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head. FIT / INTEGRATION: VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial, Designed for ultimate integration with Smith performance eyewear for maximum comfort, venting and storage convenience, AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses. FEATURES: 21 fixed vents for consistent airflow, Performance comfort lining, Lightweight, low-bulk single layer webbing WEIGHT: (Size M, MIPS) 11oz / 300g CERTIFICATION: CPSC, CE EN 1078
$79.99
- Compass fit - 11 vents with increased air flow - Compatible with click-mount light - Lightweight - Integrated brim - Lay flat strap dividers - Compression molded pads - Light & durable dual shell - Snowsport knit compatible - Average weight: 350g Sizing: - Small = 52 – 55.5cm - Medium = 55.5 – 59cm
$69.99
- Street-smart looks and classic line - Fully upholstered, non-adjustable fitted interior in 5 sizes for the perfect fit - MIPS equipped for maximum protection - EPS/Thin Shell constructions uses a thin ABS shell lined with EPSFoam to create a burly lightweight lid - S: 54-55.5cm, M: 55.5-57cm, L: 57-59cm, XL: 59-60.5cm, XXL:60.5-62cm
$79.99
- Compass fit - 11 vents with increased airflow - Compatible with click-mount light - Lightweight - Integrated brim - Lay flat strap dividers - Compression-molded pads - Light & durable dual shell - Snowsport knit compatible - Average weight: 350g - Helmet sizing in cm: 59 - 62cm
$79.00
The MET Eldar MIPS has been re-designed for young riders who are fearless and skilled. A high quality helmet for those who aspire to ride the Enduro World Series one day. With extended coverage of the head it offers ultimate protection for those who dare to do more. Featuring the MIPS-C2 brain protection system, the Eldar is able to slide against the head in the case of a crash, redirecting damaging rotational motion. - In-mold polycarbonate shell with EPS liner - Extended head coverage for more thorough protection - MIPS C2 rotational management system is engineered to add protection in case of certain impacts - Exceptionally comfortable and secure on the head thanks to its refined internal shape - 14 vents are internally engineered for air channeling to improve ventilation and comfort - MET Safe-T Twist 2 Fit System - 360° head belt reduces pressure points on the head - Straps with adjustable dividers offer a customized fit - Reflective rear decal to enhance visibility - Comfort pads are hand-washable - Weight: 305g Sizing: - One Size = 52 – 57cm
$64.99
The FeatherWeight features In-Mold technology to make a custom shape and fit utilizing a thin outer shell that covers and protects high-density EPS foam. - High density EPS in-mold construction - Tested and certified for CPSC and EN 1078 standards for bicycle use - Two sets of padding included for custom fitting - Crow rivets and 10 flow-vents to keep cool - Small/Medium = 50 – 56cm - Large/X-Large = 58 – 61cm
$99.99
Five steps up from your standard trail helmet! A lightweight all-purpose MTB helmet for trail riding, cross-country training, and backcountry or gravel adventures. This helmet is well-ventilated with maxiflow air channels and the Dri-Lex® liner is washable, moisture-wicking, anti-odor, and breathable. What is most important about the Leatt MTB 2.0 helmet is the head and brain protection level it offers. Featuring 360 Turbine Technology, the helmet is lined with turbines which are 360 °moving discs constructed from an energy-absorbing foam and material. This tech has two exclusive advantages, namely the reduction of rotational acceleration to the head and brain and the absorption of energy upon impact at the concussion level. Be comfortable and ride safely. Details: - Lightweight Polymer Compound shell in three sizes - MaxiFlow impact foam air channels are effective even at low speed - 360° Turbine Technology - Reduced peak brain acceleration by up to 30% at impact speeds associated with concussion - Reduces peak brain rotational acceleration by up to 40% - In-molded impact foam for great energy absorption - Maximized ventilation with 20 vents - Visor with breakaway function for rotational impact force reduction - Dri-Lex® moisture-wicking, breathable, anti-odor, and washable inner liner - Weight: from 300g (0.65 lbs) - Certified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203
$69.99
- Ez-fit system - 13 vents with increased airflow - Removable flip visor - Lightweight - Lay flat adjustable straps - Compression-molded pads - Asteroid light compatible - Cold weather bike knit compatible - Average weight: 305.5g - MIPS: multi-directional impact protection system Helmet sizing: - Small: 52 - 55.5cm - Medium: 55.5 - 59cm
$79.00
MET Miles MIPS is a touring helmet with road spirit. It has a comfortable shape and plenty of vents to enhance air flow. Featuring the MIPS-C2 brain protection system, the Miles is able to slide against the head in the case of a crash, redirecting damaging rotational motion. MIPS is engineered to add extra safety to the standard construction of helmets in case of certain impacts. The MIPS Brain Protection System (BPS) is attached inside the helmet, between the comfort padding and the EPS. The unique 360° head belt ensures that there will be no pressure points on the skull, allowing you to achieve the perfect fit. - In-mold polycarbonate shell with EPS liner - MIPS-C2 Brain Protection System offers extra protection in the case of certain impacts - Safe-T Twist 2 Fit System - 360° head belt and vertical adjustments offer a customized fit - Straps with an adjustable divider provide a customized fit - Reflective rear decal to enhance visibility - 18 vents are internally engineered for air channeling to improve ventilation and comfort - Comfort pads are hand-washable - Reflective rear decal - Certifications: CE; AS/NZS; US Sizing: - Small/Medium = 52 – 58cm - Medium/Large = 58 – 61cm
$84.99
The Hyban 2.0 combines a particularly robust, hard shell with huge air intakes. In combination with the bright, integrated LED rear light, the Hyban 2.0 is the perfect everyday helmet for the city. - ABS hard shell: Robust helmet made of EPS foam and injection molded outer shell - High visibility: High visibility due to reflectors - Bug mesh: Full protection from insects - Ponytail compatibility: Perfect fit for people with long hair - Full-ring: Adjustable ring connected to adjustment system enclosing all of the head - Excellent ventilation with 5 air inlets and 8 air outlets - Zoom Ace Urban: Finely adjustable adjustment system with handy adjustment wheel for a customizable fit - Large, high-mounted, and integrated LED taillight with 180° visibility Sizing: - Medium: 52-58cm - Large: 56-61cm - X-Large: 58-63cm
$55.00
Inspired by gravity riders and presenting a modern mountain biking style, this off-road helmet is designed with generous ventilation and added protection Along with essential safety features like MIPS technology, we’ve added a lower rear coverage design to shield more of the back of your head. Direct Flow Cooling channels are designed to pull in air to keep you cool during slow, challenging climbs or flowy descents. With a one-handed dial adjustment and rear fit system you get perfect head-hugging comfort. - Simple, clean and compact helmet shape - Optimized vent design for enhanced breathability - MIPS brain protection system and lower rear coverage - New 360° full surround fit-belt - Intuitive one-handed dial adjustment (Cinch ONE fit system) - Compatible with Alumbra taillight: Liv proprietary taillight docking station - In-molded construction for added strength - TransTextura moisture-wicking, anti-odor inner padding - Pony-tail friendly rear fit system space - Detachable visor - S / M (49-57cm), M / L (53-61 cm)
$54.99
The Scraper 3.0 is just as much at home on the bike as in the halfpipe, protecting the BMX rider as reliably as the longboard fan. And, with the optional winter kit, you can get after it in all types of weather. The intelligent ventilation system, with its many inlets and outlets, and the numerous adjustment options that adapt the Scraper 3.0 to each head in a few easy steps, ensure the greatest possible comfort. - ABS hard-shell technology - High visibility due to powerful reflectors - Ponytail compatibility: Helmet well suited to plait wearers - Forced Air Cooling Technology: Sophisticated ventilation system for an optimal head climate - Excellent ventilation with 4 air inlets and 4 air outlets - Size adjustment by means of a half-ring made from particularly hard-wearing and slightly malleable plastic for optimal stability and fit - Zoom Ace Urban: Finely adjustable fit system with a handy adjustment wheel Sizing: - Medium: 54 – 58cm - Large: 57 – 62cm