Dial fit system enables precise adjustments as your child's head grows \n Patented PopLock to secure the helmet with your lock, backed by our AntiTheft Guarantee \n Onehand, nopinch magnetic fastener \n Compatible with magnetic helmet tail light for additional visibility (sold separately \n Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older \n Certified for CPSC and ASTM standards for cycling, roller skating, and skateboarding \n Third party online sales strictly prohibited by manufacture