Every piece of equipment matters and confidence in your helmet is key, which is why Bucky chooses Pro-Tec. The Bucky is his signature Pro-Tec Helmet that sits with a lower profile than most other helmets. Built with a durable high density polyethylene shell with a 2-stage foam liner that keeps your head safe from slams, while the deeper fit and fully wrapped Dri-Lex liner make this helmet instantly comfortable. Eleven open vents acorss the helmet help to keep you cool by allowing air to flow through and vent out hot air. Size Guide: XXX-Small: 47 - 49cm XX-Small: 49 - 51cm X-Small: 52 - 54cm Small: 54 - 56cm Medium: 56 - 58cm Large: 58 - 60cm X-Large: 60 - 62cm XX-Large: 62 - 64cm Size: Small