The sizing of a shoe is very unique to the shape and size of your foot and proper fit is very important. Too small of a shoe and you may end up with pinched toes, cramping, and discomfort, too loose and your foot may end up slipping around inside the shoe which can cause blisters and result in a reduction of control. Fit preferences vary, of course, but most people generally can start at or near their everyday shoe size and go from there. Given that our shoes are a contact point for control of our mountain bikes, however, many people will opt for a snug fit that is achieved by sizing down slightly from their regular street shoe size. And, of course, sizing is not perfectly consistent across different brands, so it is generally best to try shoes on before you buy to ensure they fit you correctly.