High-impact ABS external shell with high density polystyrene internal lining offers proven protection. Adjustable padded chin strap adds comfort and keeps helmet firmly in place. Top and side adjustable vents for climate-control airflow ventilation to keep your head warm, dry and comfortable. Audio vents for clear hearing. Maplus goggle compatible for optimal wide-angle vision. DH and Slalom chin guard compatible for full face protection. Varnished ABS external cap with air inakes. Colorful resined or under varnish adhesive labels. High density polystyrene internal cap. 'Sanitized' Carvel anallergic/breathable velvet lining with aeration filter. Nylon quick release retention system. Rubber on Nylon elastic band fastener. Chinguard compatible. Homologated by C.S.I. and F.I.S.I. and in accordance with EC directives. Available in Black Matt, White Matt, Red Matt, Blue Matt, Silver Metal and Black Metal. Sizes: XS (54cm or 21 1/4" or 6 3/4 precise hat size) , S (56cm or 22" or 7 precise hat size) , M (58cm or 22 3/4" or 7 1/4 precise hat size), L (60cm or 23.5" or 7 1/5 precise hat size) and XL (61cm or 23 7/8" or 7 5/8 precise hat size).