SmartDealsNow YOUTH DOT Helmet Blue/Flame Color Dirt Bike Style Youth Model (Medium) Certified to meet the DOT standard (FMVSS 218) Light weight extremely durable composite shell, Dot Approved Removable and washable padding; Well vented all purpose product for off-road riding. Heavily cushioned and very comfortable interior Youth Medium Size: 20.1" - 20.5"