Snowboard boots use traditional US number sizing, but actual boot sizes can vary by manufacturer and even by model within a single manufacturer's line. For example, the outsole of manufacturer A's size 11 might be slightly longer than the outsole of manufacturer B's size 11. Similarly, there are some boots specifically built with a low profile. The shorter outsoles of a low profile boot allows a rider to use a narrower snowboard. Additionally, the ramp angle on snowboard bindings also partially determines how large of a boot you can put on a particular snowboard. Another reason why we would rather you came to see us.
When it comes to compatibility with your snowboard, the size of your boot is important to take into consideration. People with larger (11.5+) and smaller (<7) boot sizes should purchase wider and narrower boards, respectively.