features removable sun visor, 22 air vents, easy-to-turn dial, adjustable straps, and moisture-wicking lining pad to give the riders wonderful cycling experience. It is a great protective gear for anyone who love bike riding, scooter, skating, and other sports. Features: In-mold polycarbonate shell with EPS liner for impact resistance and protection. Removable sun visor shades your eyes from harmful sun rays. 22 air vents keep the rider\'s head cool and reduce helmet weight. Easy-to-turn dial for size adjustment to suit for 21.7 - 24.0 head circumference. Adjustable side straps for customized fit; padded chin guard for added comfort. Soft lining pad absorbs shock and wicks moisture away, removable and washable.