The zipper is a little bit stiff, but no problems zipping them up or down. Nice little boot, first time I wore them a random man walking by said "nice boots" lol. This is where is worked extremely well with the Oppo PM-3s). Awesome light makes my truck a lot easier to see for such a reasonable price great value and it is one of the best products I have ever found. I would recommend if you?re in a spot like me. I?ll update once It is no longer ?brand new?. The bottoms were dirty and the foot bed had clear footprints. These slipper boots are very nicely made. So easy to just crimp this properly. 40s, but the QC35 doesn?t let you turn off noise-cancelling.