I was leary of buying a zipper boot online, but my father talked me into trying the Dura-shocks. I have had these boots for about a year now, and have had a very positive experience with them. I got lazy and have used the zipper almost every day around some pretty large calves/legs without any problems. The cushioning is very good. The only two issues I have had is that they tend to run wider/larger than stated size. I wear a 12 wide, and had to go a 12 medium, with plenty of room. Also, the soles/tread does get very stiff or hard in really cold weather, which can get slippery especially when you enter a tiled floor area.