Gel Therapy Socks are designed with a soft gel lining that comfortably conforms to your feet while gradually releasing medical-grade mineral oil to moisturise and lubricate dry, cracked, callused skin. Gel Therapy Socks are made from bamboo charcoal. Hypoallergenic and latex-free. This product is washable and reusable. Fits up to Size 13 US Mens Shoe Size.