Dr. Scholl"s® For Her Rub Relief™ Strips FEATURES Soft foam strips cushion sensitive spots to help prevent rubbing and blisters Easy-to-use dispenser cuts strips to any length without the need for scissors Up to 5 feet of cushiony foam Custom strips fit anywhere inside shoes Won"t slip off when walking Can be removed without damage to shoes Blisters form when skin rubs against another surface, causing friction. This causes a tear or separation within the upper layers of the skin (the epidermis), forming a space between the layers. The surface is usually intact. Fluid seeps into the space, causing the top of the blister to pop out from the skin surface. 3.4 inch x 30 inches Cushions Sensitive Spots Helps prevent rubbing Adjust to any length Perforated along the middle for narrower strips.