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Bern Macon Ski Snowboard Helmet Matte Black + Boa SM02EMBLK Weight 435-470g Thin Shell A thin ABS shell lined with EPS foam to create a burly lightweight All Season lid. Boa Cold weather liner with micro adjustable fit system. Drop in audio compatible. Standards EN 1077B, EN 1078 Please select your size above when completing checkout See Size Guide below (PLEASE NOTE THIS IS AN ESTIMATED SIZE GUIDE ONLY): Size Chart: S-M 54 - 57cm 6 3/4 - 7 1/8 L-XL 57 - 60.5cm 7 1/8 - 7 5/8 For most accurate head measurement, measure circumference of head with tape measure or piece of string (then measure the string with a tape measure or ruler) just above eyebrows to back of head.