The Livall KS2 Smart Kids Helmet is a lighter helmet with better protection; especially popular with children due to the colourful top light which is USB chargeable and switched on by tapping the side of the helmet, a feature which helps kids get interested in both riding and safety. The unique ventilation design allows wind to quickly pass through the air channel between the head and helmet, keeping children's heads dry and comfortable. The precise tension adjusting system secures fitting to different head sizes and addresses both safety and comfort. Constructed through unibody molding with imported American EPS foam and high quality polycarbonate. The Nylon strap, with reliable stretching resistance, will not be distorted by water or sweat. Suitable for a child with a head circumference 5056cm, Helmet weights 290g.