May be attached under the heel area of Formthotics to elevate the calcareous. Can be attached directly into the heel cup of a shoe. Will alleviate Achilles tendon and triceps surae strain.Assists in balancing leg length discrepancy. Improves function in a forefoot equinus. Hard density Formthotics Formax™ foam for durability. Popular red heel raisers available in heights of 4 or 6mm. Self-adhesive on base simply adheres to the sole of your shoe.