This is Brand New Lucky Bums Adult Ski and Snowboard Helmet. This helmet comes in sizes XS (53-54cm), Small (55-56), Medium (57-58cm), Large (59-60cm) and Extra Large (61cm) and in the following colors - Black, Red, Blue, Silver, Metallic Black with Pink Trim, Metallic Black with Red Trim, Matte Steel with Blue Trim and Matte Stell with Green Trim. Features include: External cap in ABS material provides solid and durable protection Supporting shell in EPS material has controlled density and air flow channel The comfortable internal fabric lining and ear padding has an allergic and antibacterial treatment Ear Pads are Removeable Padded chin-strap Goggle Strap on back of helmet Micro-adjustable head strap for the perfect fit Certified (CE EN1077)helmet that meets applicable safety standards SizingHelmet sizing is not an exact science as each person"s head is shaped differently. The following sizing guidelines work for 95% of our customers. Your size is determined by measuring the circumference of your head. Get a Measuring Tape - To determine the correct size, wrap the tape around your head, just above the eyebrows. Note your size at point of overlap. This is your helmet size. Conversion Chart Below Centimeters to Inches 50.00 ---- 19.69 51.00----- 20.08 52.00----- 20.47 53.00----- 20.87 54.00----- 21.26 55.00----- 21.65 56.00----- 22.05 57.00 -----22.44 58.00------22.83 59.00------23.23 60.00 -----23.62 61.00----- 24.02 62.00 -----24.41 63.00 -----24.80 64.00 -----25.20 65.00----- 25.59 66.00----- 25.98 Satisfaction Guaranteed!!