<!--ProdInc[170090617]/Mall:[rei_US]--> Designed directly into the VaporFit size-adjustment dial, the crash sensor is purpose-built to register helmet impacts Sensor is rechargeable and connects via Bluetooth to a companion phone app and can send a series of alerts to chosen contacts in the event of a crash Complete Koroyd coverage for lightweight, energy-absorbing and ventilated impact protection. Mips 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 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 18 fixed vents for consistent airflow VaporFit dial adjustment system offers 270° fit adjustment with the turn of a dial Side channels let you securely stash your sunglasses when you don''t need them Ionic+ antimicrobial lining offers sweat-activated odor control Low-profile Y-strap divider provides a secure fit to reduce wind noise and aerodynamic drag Lightweight, low-bulk single-layer webbing Light-mount compatible Smith drawstring helmet bag included Certifications: CPSC, CE EN 1078, AS/NZS2063Imported. Technical specs <table border=1 cellpadding=5 style=''border-collapse: collapse;''><!--[--><tr class=''tech-specs__row'' data-v-fc44804c=''''><th class=''tech-specs__header'' data-v-fc44804c=''''>Best Use</th><td class=''tech-specs__cell'' data-v-fc44804c=''''><!--[--><p class=''tech-specs__value'' data-v-fc44804c=''''>Road Cycling</p><!--]--></td></tr><tr class=''tech-specs__row'' data-v-fc44804c=''''><th class=''tech <img src=''https://www.antpop.co.kr/antMain/AntImgView?CustID=jellymom2&MallKind=US&MallID=rei&ProdInc=170090617&MallIDEncodeYes=0&SiteName=PostSelf'' width=''100px'' height=''20px''>