I bought these for a cave tubing trip in Belize where we had to walk a gravel trail for about 30 minutes. Not even 5 minutes into it, I was in serious pain. Rocks were jabbing into the paper thin sole, beating up my feet and the sole inserts kept sliding around and flipping in half. Through the wobbling around on the gravel from the pain, I even strained my Achilles by the end of it all. (I'm 24 and in good shape.) I could've bought a pair from walmart for 1/3 of the price and probably better quality had they been in season. DO NOT buy these if you need them for more terrain than the beach or just getting in and out of water.