Back Wrap Heat BagsOur Back Wrap Heat Bags have 8 individual panels sewn into them so that the heat is evenly distributed across your lower back. We use 100% Cotton and fully adjustable strong Velcro to hold your back wrap in place. They can also be used across your stomach to help relieve stomach cramps. Or sideways across aching hips. Can also be used as a COOL PACK Just put your Back Wrap inside a ziplock bag and place in your freezer. No need to go without your Back