The metal loop that the strap feeds through is cheap and bends without much force. Luckily when mine popped off I was able to find it and bend it back in place with my fingers long enough to make it back to the house. Yes I bent it with my fingers! I meant to return these after our trip due to such blatantly cheap production but they got put with the ski stuff and I forgot. I'll have to go get better fasteners from a hardware store before I use again.<br />The only pro: they kept my feet warm in mid grade cold if not overly so.