Made of medical grade silicone for long-lasting support and comfort. Silicone gives optimal absorption of the shock generated from everyday and high-impact heel strike. The blue spot in the heel cushion has a softer durometer profile at the heel for enhanced comfort. The shape of the cushion and the medial position of the soft blue spot help relieve pressure and pain on the most sensitive area of the plantar fascia. Non-irritating and odor-free silicone will always remain soft and retain its shape. It is the ideal foot care material. Packaged in pairs. Size according to US shoe size. Quantity: 1 Pair Size: Small or Large Material: Silicone Manufacturer: FLA Orthopedics Options: Small (F131) UPC: 719869537618 Large (F133) UPC: 719869537625 Sizing Guide: Small: Women s: 5 - 8 / Men s: 3 1/2 - 7 1/2 Large: Women s: 8 1/2+ / Men s: 8 - 15