I wore this for about a month this summer. I work in a warehouse, so there's no mud or oil stains. I use it with a frozen plastic bottle and a small amount of water. It feels like the plastic bottle melts in about 4 hours, so it's best to use two bottles alternately. The battery also lasted for 7 hours continuously. The clothing itself has no scratches or stains, but there are some scratches on the battery. (There is no problem with performance)