Slide the FITCLIP up, adjust the length of the helmet. MICRODIAL adjusts circumference by tightening the stabilizer straps for a true customized snug 360 fit. Molded grip textured comfort cushins, mechanically attached EPP liner and composite subshell is lightweight & stiff. Maxvents venting throughout the helmet keeps player cool. Transluscent ear covers,secure-strap ear loops. Zinc plated flat/star screws minimize rust. CSA/HECC and CE certified Sm : 6 3/8"-7, Md:6 7/8-7 3/8, Lg:7 1/4-7 7/8, Xl:7 5/8-8 Black