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Crazy Al's has proudly been eradicating mushroom head with DOT Approved Ultra Low Profile helmets since 2008. Ultra Low Profile Beanie helmet, say goodbye to mushroom head! This is the helmet that over 50,000 riders wear! Smallest & lightest DOT shell size ever made! Meets or exceeds DOT FMVSS No. 218 standards Quick release adjustable straps for easy helmet removal Designed in North America, Manufactured in China, Made of Fiberglass Only use water to clean our helmets SIZING: Our helmets fit differently - please verify your size with our sizing chart SIZING NOTE: Helmets are quite snug when brand new, but relax and mold to your head over the first several rides To measure your head for the correct size take a tape measure just above your brow around your head just at the top of your ears. If your head measures in between sizes order the size smaller. SIZING CHART XXS 50.8 - 52.07 inches | 20 - 20 1/2 cm XS 53.02 - 53.98 inches | 20 7/8 - 21 1/4 cm S 54.93 - 55.88 inches | 21 5/8 - 22 cm M 56.83 - 57.79 inches | 22 3/8 - 22 3/4 cm L 59.05 - 60.00 inches | 23 1/4 - 23 5/8 cm XL 60.96 - 61.91 inches | 24 - 24 3/8 cm XXL 62.87 - 64.12 inches | 24 3/4 - 25 1/4