SmartDealsNow YOUTH DOT Helmet Green/Flame Color Dirt Bike Style Youth Model (Medium) Certified to meet the DOT standard (FMVSS 218) Beautiful Gloss UV protective finish and Light weight extremely durable composite shell 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"