I dont know how theyll hold up, but Im extremely impressed so far. Dont have buyers regret. Please be careful when giving these to youngsters and dont assume they will protect precious hearing when the musics volume control knob and adult supervision are ignored. Tried two different phone holder for my bike. I used to buy my slippers at Target and theyd last about 6-9 months. I think they sent 30mm and I ordered 40 or 45mm but I had to order a set and it cost $12. I would suggest some quality checks before an item is sent. I have an older topeak disc 26 rack that the seat will not fit on to. I bought these to wear at the beaches of Long Island. I actually returned it.