DOT Certified for Safety - Meets FMVSS-218 and DOT Safety Standard Light-weight but extremely durable composite ABS shell, beautiful glossy UV protective finished, protects your head from injury and keeps you safe and comfy while riding Adult helmet size chart: 【Md Centimeter: 55-57CM=21.65-22.44nches】; 【Lg Centimeter: 58-60 CM=22.83- 23.62 inches】; 【XL Centimeter: 61-62CM=23 3/4 - 24 1/4 inches】; 【XXL Centimeter: 63-64CM=24 4/5 - 25 1/5 inches】 Well vented for optimum air flow all purpose product for summer or winter riding; Well vented for optimum air flow all purpose product for off-road riding PACKAGE INCLUDED: -1x Helmet;
FEATURES:
Beautiful glossy UV protective finished
Light weight extremely durable composite shell
Heavily cushioned and very comfortable interior
Removable and washable padding
Well vented all purpose product for summer or winter riding
Well vented all purpose product for off-road riding

Head Circumference:
Adult helmet size chart:
Md Centimeter: 55-57CM=21.65-22.44nches;
Lg Centimeter: 58-60 CM=22.83- 23.62 inches;
XL Centimeter: 61-62CM=23 3/4 - 24 1/4 inches;
XXL Centimeter: 63-64CM=24 4/5 - 25 1/5 inches

Size Guide:
To ensure proper sizing, please do the following:
Take a head measurement with a cloth tape measure.
Wrap tape measure around your head one inch above your eyebrows, directly above your ears and to the widest area at the back of your head. The widest measurement will give you your helmet size.
If you don't have a tape measure, you can use a piece of string and measure using a ruler.