Cyclists typically look for a firm fit without too much compression, so that the warmers will stay in place without affecting movement. Attaquer cycling warmers fit very true to size, so your cycling bibs can be a helpful reference. For men the right warmer is likely to be the same size as your cycling bib size, while for women we suggest trying one size lower than your cycling bib size. You can also input your measurements on the product page to find a tailored sizing suggestion.