The first time I put it on, I didn't do any physical exercise, and when I took it off, there were 7 very small holes in the seam on the back shelf. If it was tight, I would think I ripped it, but it was loose. After wearing it for 9 days, I bent down today to tie my shoelaces and the whole pocket on the side opened. Okay, very economical product but still, not to become a paper war in nine days