Maplus S2 Ski Helmet (Blue)

High-impact ABS external shell with high density polystyrene internal lining offers proven protection Top and side airflow ventilation to keep your head warm, dry and comfortable Maplus goggle compatible for optimal wide-angle vision Sizing: XXXS (50cm or 19 3/4" Toddler ages 18 months to 4 Years), XXS (52cm or 20 1/2" Kids ages 4 to 8 Years), XS (54cm or 21 1/4" Youth ages 8 to 14 years or 6 3/4 hat size), S (56cm or 22" or 7 hat size) M (58cm or 22 3/4" or 7 1/4 hat size), L (60cm or 23.5" or 7 1/2 hat size) and XL (61cm or 23 7/8" or 7 5/8 hat size)