Adhesive back - The adhesive is intentionally "sticky" so that the Hapad metatarsal foot pads will not slip in the shoe once it is properly placed. Comfortable - The metatarsal pads are made of 100% wool felt which provides comfort and relief. Highly Recommended - These metatarsal pads felt are medically designed to treat metatarsalgia and dropped metatarsal heads. 1/4" Hapad Metatarsal Pad (Small) is highly recommended by many physicians to achieve 100% Morton's Neuroma foot pain relief.