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 I�ve been using and completely forgot to attempt a return.
Have used the Sealskinz for several months now. Snug fit, waterproof and do a good job of keeping my feet warm in cold/wind down to high 30s. I don't ride in the rain much, but keeping warm is important and these do a good job without a lot of bulk
