PLEASE BE SURE TO MEASURE YOUR HEAD BEFORE PLACING YOUR ORDER!! * Bauer Sizing Guidelines: Helmet Size / Hat Size / Head Circumferences - Small / 6 1/2 -7 1/8 /20.5" -22.6" (52-57.5 cm) - Medium / 6 3/4 - 7 3/8 / 21.3" - 23.2" (54-59 cm) - Large / 7 - 7 5/8 / 22" - 24" (56-61 cm) * CSA, HECC, CE Certified * Protection & Comfort: Dual-density foam liner - Consist of 2 VN foams - Dual-Ridge crown offers protection against impacts - Front, back and top vents keep the player cool - Attached plastic ear covers with comfort foam pads * Customized Fit: Single-tool sizing adjustment - F.A.S.T Adjustment - Compatible with all Nike Bauer and Bauer cages and visors