Feature●Size (head circumference): S, M, L, O, XO●Size S: Approx. 21.3 inches (54●Size M: Approx. 22.0 inches (56●L Size: Approx. 22.8 inches (58●Size O: Approx. 23.6 inches (6●XO Size: Approx. 24.4 inches (62Description
Square on the top of the head and round sponge on the back of the head for added shock absorption and protection and covering the entire head.