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The Blist-O-Ban is an extremely thin blister bandage containing a self-inflating bubble that looks and functions like an actual blister-minus the pain. Each Blist-O-Ban bandage is comprised of several laminated layers of breathable plastic film bonded together, except for the "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. Small is best for toes and medium is best for heels. These really work. Staff favorite.