Lightweight Shell - ABS material ensures the safety performance of the helmet, Hawk helmet meets D.O.T. FMVSS 218 safety standards Adjustable Quick Release Straps - take off your helmet with one easy pull, same ABS material for reliable quality 1/2 Hawk helmet has a unique shape, bringing a comfortable and safe experience to motorcycles, mopeds, scooters, cruisers Breathable Inner Liner - A large area of breathable mesh material is used inside the helmet for freedom and comfort Unique Shape - cool shell and lower wind resistance Yesmotor Hawk Half Helmet :Weight: 600g (1.32 lbs)Volume: 30*24*17cm★Adjustable quick release straps - take off your helmet with one easy pull, same ABS material for reliable quality★Breathable Inner Liner - A large area of breathable mesh material is used inside the helmet for freedom and comfortNote:1. Applicable head circumference of helmet: M (54-55CM) L (56-58CM) XL (59-61CM) XXL (62-64CM).2.Please measuring your head before bidding. Take a head measurement with a cloth tape measure. Wrap tape measure around your head one inch or 25mm or 2.5cm 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.3.If you have any questions, please contact us, our customer service team will reply you within 24 hours.