Bought a medium based on the size chart and they were a pretty tight fit. Used them once without issue, carefully pulling the on and getting them squared away. Kept my feet dry and warm in a pretty gnarly Pacific Northwest rainstorm. Second time using them, same gentle approach, the pull strap broke. Still usable, just less convenient to get on. I had a backup pair of Castelli shoe covers that Iï¿½ve been using and completely forgot to attempt a return.