Heel lifts are an effective and simple treatment for plantar fasciitis, heel spurs, Achilles tendonitis and Sever's Disease. Also used for elevating the heel; treating sore and bruised heels. Protective padding for heel discomfort and painful areas under the heel. Felt Heel Pads can also be used for Limb Length Discrepancies because it won't compress as much as Foam. Adhesive back - The achille inserts come with easy to peel off back with adhesive to keep it secure at the best position in the shoe