Invisible Barrier! Protects Feet From Shoe Rubbing. Smooth glide formula Powder dry invisible finish. Dr. Scholl's For Her Miracle Shield is a convenient way to protect your feet from irritation and rubbing. This formula goes on smooth and turns powder dry form an invisible barrier between you and your footwear. The Dr. Scholl's Guarantee: If you are not completely satisfied with your purchase, mail in the original UPC code from the package along with your receipt to the address listed on the packaging.