I wear a size 10.5 men's shoe. I first ordered the large size because it said it fits 9.5 - 11 men's shoes. The shoes I wanted to use with these overboots was a hiking shoe with turf cleats on the sole. Well, the large didn't fit. Amazon is great about returns so no problem there. I next ordered the XL men's size which supposedly fits 11 - 12.5 size shoes. Those didn't fit either. In fact, when I put my hiking shoes against the overboots, sole to sole, the shoes were longer than the overboots.

So that's why I titled my review "dress shoe boots". The sizing appears to be for dress shoes, but any shoe with a substantial sole may have a hard time getting in. I'm going to give it one more try and order the XXL. Normally I wouldn't go to this much trouble but these overboots are really nice - very supple yet they appear to be very strong. The big problem is getting the right size. And when I finally get the right size for my hiking shoes, I'm sure my dress shoes will swim in them.