Bell Venture Bike Helmet Universal fit adult bicycle helmet ideal for bike cruising, recreational touring, and recreational MTB ErgoDial fit system for one-handed fit adjustments; cam-lock levers for easy strap adjustment 23 vents allow cool air in and warm air out; helmet comes with removable sun visor Fusion in-mold microshell for greater durability and protection Fits head circumferences from 54 to 61 centimeters; CE EN1078, CPSC certified; one year warranty