These heel cups are hypoallergenic, non-toxic, non-flammable and odor free. Very useful for any prolonged standing or walking activity. It must have for sporting activities, especially where impact shock reduction is required. Specifications: 1.Material: Silicone Gel 2.Color: Red/Blue 3.Indications for use: Heel pain, Plantar fasciitis, Heel spur, Knee and back pain, Ankle pain. 4.Size: for Women:10 x 6 x 2cm for 34-38 sizes shoes Note: Size for manual measurement, there may be a 0 to 2 mm error, belonging to the normal phenomenon. Package Included 1 Pair Shoe Pad