Seems others have experienced some string/thread pulls so I am sharing my experience. Only wore this a couple of times total. Last time I wore this under my rain jacket while walking around town. When I took my jacket off, I noticed some thread pulls. Based off where the thread pulls happened I know it wasn't from snagging on a zipper or anything super rough. There was a seam on the inside of the rain jacket in the same area that was slightly rough. Pretty surprising that it would cause this kind of damage though so I am not totally sure what happened.