Details The Smith Session all-mountain helmet is made for the rider that wants speed and style in one protective package- the rider who likes to earn their ride through the climb, but is still really in it for the downhill. The ultralight feel and innovative protection of Koroyd® in strategic, zonal impact areas let you bomb and blaze with confidence. Generous air ports on the top work with internal air channels to provide ventilation that keeps you cool on the uphill and helps maintain your focus in descent mode. Plus, it accommodates easy goggle or eyewear storage so you can sit back and enjoy the view from the top without accidentally smashing your gear. Construction Zonal Koroyd® coverage for lightweight, energy-absorbing and ventilated impact protection In the event of an impact, Koroyd's welded tubes collapse instantly and evenly, absorbing maximum force in a controlled manner and thus reducing the amount of energy transferred to the head. The air circulates evenly through the open cells, while the warm air in your head can easily escape, ensuring more efficient cooling under the most intense conditions. Characterized by tubes with the thinnest walls in the world, the Koroyd structure is composed of 95% air. This reduces weight and improves comfort without compromising safety. MIPS® Brain Protection System Found inside the helmet, generally between the comfort padding and the EPS (a high-quality foam used to reduce energy), MIPS® (Multi-directional Impact Protection System) BPS reduces rotational forces caused by angled impacts to the head. For certain impacts, the MIPS® BPS can reduce harmful forces transmitted to the brain. Integrated skeletal structure creates a roll cage for added strength and impact protection CPSC and CE EN 1078 certified Fit Lightweight, low-bulk single layer webbing Ventilation 15 fixed vents for consistent airflow AirEvac™ ventilation system integrates with Smith goggles and eyewear for fog-free lenses Details Three-position adjustable visor Ionic+® antimicrobial lining offers sweat-activated odor control Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort, venting and storage convenience Helmet Size S51-55cm M55-59cm L59-62cm Weight (Size M, MIPS®): 13.4 oz / 380 g Smith Session MIPS Bicycle Helmet