Long winding descents and race-day lead-outs, the Smith Trace is all about versatility. Road, gravel or bikepacking, this bike helmet pairs complete KOROYDA(R) with MipsA(R) for protection you can trust if the route gets hairy. And when the day heats up, you&';ll stay cool thanks to internal air channels with intake and exhaust ports that keep the air flowing. Side channels let you securely stash your sunglasses when you don&';t need them, and when you do, our AirEvac ventilation system prevents them from fogging up. Product Details Protection Aleck Crash Detection Sensor sends alerts in the event of a crash. It&';s rechargeable and connects via Bluetooth to the companion Aleck phone app Complete KOROYDA(R) coverage for lightweight, energy-absorbing and ventilated impact protection MipsA(R) Brain Protection System reduces rotational forces caused by angled impacts to the head Integrated skeletal structure creates a roll cage for added strength and impact protection Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older as well as CE EN 1078 Fit / Integration Designed for ultimate integration with Smith performance eyewear for maximum comfort, venting and storage convenience AirEvac ventilation system integrates with Smith eyewear for fog-free lenses VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial Features 18 fixed vents for consistent airflow Ionic+A(R) antimicrobial lining offers sweat-activated odor control Lightweight, low-bulk single layer webbing Weight (Size M, MipsA(R)): 10 oz / 280 g Additional Specs Product Id: E007651UX5559