We have the foot muff already the second winter in use. He keeps you warm even in freezing temperatures. The zipper is all round and there are two slides, so you can let the sack down open when the kid's shoes are times wet or dirty. Sometimes (if you close the foot muff too fast) caught a fur in the zipper, which is a bit annoying. So far, it could be solved, however, again and again. Otherwise, the footmuff is really thoroughly recommended!