PediFix Visco-GEL Heel-So-Smooth Heel Sleeves are lined with Visco-GEL that releases vitamin E-enriched mineral oil onto the skin surface to help soften and moisturize rough, dry, cracked heels. Improvement is noticeable after just a few hours. Typically worn while resting, or overnight. Apply moisturizing creams to heels before use for even faster results.