The Smith Descend Helmet packs the latest impact protection into a lightweight, low-profile design that lets you focus on riding more and fussing with your gear less. It combines Mips and zonal Koroyd for enhanced energy absorption in the event of a crash. From cold and stormy to warm and sunny, adjustable vents let you dial in the climate control to match the day. Audio-compatible ear pads help keep you connected, and our adjustable dial fit lets you fine-tune the fit and feel on the fly with one hand. Features: Ionic+ antimicrobial lining offers sweat-activated odor control Regulator climate control offers easy, one-handed vent adjustment 16 vents Removable Snapfit SL2 ear pads add warmth and are audio-chip compatible Aleck audio system compatible Weight (Size M): 16oz / 400g Protection: Lightweight in-mold construction fuses the exterior shell and EPS foam for a one-piece design that's lightweight and durable Zonal KOROYD coverage for lightweight, energy-absorbing and ventilated impact protection Certification: ASTM F 2040, CE EN 1077:2007 CLASS B, CPSC, CE EN1078 Fit/Integration: Designed for ultimate integration with Smith goggles for maximum comfort and venting AirEvac ventilation system integrates with Smith goggles for fog-free lenses Adjustable dial fit for easy, on-the-go size adjustment