Saying "never again" to blisters. Blist-O-Ban does its job because of something we call the Gliding Principle?. Each Blist-O-Ban bandage is comprised of several laminated layers of breathable plastic film bonded together, except for a "bubble" in the center, where the layers are free to glide across each other. When something rubs against the Blist-O-Ban, these layers slide smoothly against each other, rather than your tender skin. There's no need to cut it to shape-no need to do anything but slap it on and go. The relief is so dramatic that people sometimes wonder whether the product contains a local anesthetic (it doesn't).