For aerobics, court sports, running, weight training, racquet sports and walking. Special cushioning in both the heel strike zone and the forefoot area for outstanding performance. Helps turn any athletic shoe into a cross training shoe. Added heel strike area & forefoot area cushion provides extra cushioning for aerobics, tennis, basketball, weight-lifting, running, walking, jogging & in-line skating. Contoured bottom layer of lightweight polymer provides extra shock absorption in the heel & arch areas. Pre-formed heel cup & arch help maintain proper foot position & stabilize the arch. SPENCO Footcare Products won"t "bottom out", a term used to describe the condition when an insole product has lost all or most of its cushioning or shock absorption properties. Spenco model # 38-034