Typhoon Youth Girl's Off Road Helmet & Goggles DOT Motocross ATV Dirt Bike MX Motorcycle Purple - Small A true youth helmet weighing less than 3 lbs, not an over padded adult helmet Helmet and goggles included Certified to meet the DOT standard (FMVSS 218) Removable and washable liner PLEASE MEASURE & CHECK YOUR SIZE BASED ON OUR SIZE CHART BEFORE ORDERING (Sizes vary by brand) SIZE CHART (inches): Youth Small: 18 to 19, Youth Medium: 19 to 20, Youth Large: 20 to 21, Youth XL: 21 to 22; (Circumference of the largest part of the head, just above the eyebrows, above the ears, and around the largest point at the back of the head). Do not pull the tape (or string) tight, leave a little slack. True youth sized smaller shells, not over padded adult helmets Meets Department of Transportation (DOT FMVSS218) requirements Liner is easily removable &amp; machine washable Soft and comfortable interior Intake vents, channel vents and exhaust vents allow maximum air flow Sculpted shell with side traction plates help keep goggles in place 3 point sun visor for added strength &amp; stylish looks Standard chin strap d-ring closure and strap keeper Helmets are light weight at just under 3lbs, however they are not recommended for children less than 5 years of age Helmet bag included Hard coated clear Lexan lens Removable nose guard 1 3/4&#034; woven strap with anti-slip silicone Replacement lenses available separately Take a head measurement with a cloth tape measure. Wrap the tape measure around the childshead one inch above the eyebrows, directly above the ears and to the widest area at the back of their head. This will give you the circumference, which is the measurement displayed.