SUNVP Unisex Bike Helmet Lightweight Scooter Skateboard BMX Helmet Durable Protect Gear for Adult Youth Material: PC,PVC and high density EPS. Weight: 0.54 lb Size: Head Circumference: 22.05-24.4 inches.Suit for Most Adult. The removable visor help to avoid foreign bodies and provide a shade for our eyes. With adjustable rotary internal regulator, adjust the tightness of head circumference size flexibility The comfortable cushion lining high-sided article velvet for shockproof.Its hole design is more reasonable, more ventilated, more suitable, more comfortable and with insect nets