Custom Fit with Hot Water Treat: Heel Spurs, Plantar Fasciitis, Plantar Fat Pad Atrophy, Ankle Injuries, Lower Back Pain Provide comfort and protection and relieve heel and lower leg pain for jumpers, hurdlers, runners, and walkers. The heat moldable material is exceptionally strong. Place heel cup in warm water for 2 minutes to make it pliable. Place them in the shoe and step onto the heel cup., very pliable, and ultra thin. Medical Grade. As Dispensed From Doctor's Offices The plastic heel cup protectors provide comfort and protection and relieve heel and lower leg pain for jumpers, hurdlers, runners, and walkers. Unlike athletic shoes, Heel Protectors (Plastic Heel Cups) never wear out. As shoes provide less support, the heel Protector takes up the slack. Heel Protectors are lightweight, but they absorb blows and will not fall apart or deteriorate after constant use. The material is exceptionally strong, very pliable, and ultra thin. Fits comfortably around the heel – can be worn over or under a sock.