Hot Selling 2017 Hypoallergenic Adhesive Anti-Slip Soles Are Here! We invented Naked Foot Fit to keep your feet effectively protected and at the same time support all of the amazing things it can already do. Naked Foot Fit is designed in Switzerland and is produced without harming people, animals or the environment (vegan and barefoot friendly). WHAT IS IT GOOD FOR? ROCKS - Antislip and resistant, for every soil. SAND - Walk on hot sand (surface) without thinking (thoughts). WATERPROOF - Naked Foot Fit saves the feet of your children from warts/verrucas and dangerous slips. SPA - You will spend a day out of thinking Patent-pending technology, patent-pending brand. Material:Cotton/Spandex Size S: 220 * 110mm M: 280 * 110mm L: 300 * 110mm FAQ How long does it last? Depends on the use, if not used in water can last longer than 24 hours. Does Naked Foot Fit work in water? Yes. Naked Foot Fit is waterproof. However, if you stay in water for too long, the adhesive may lose part of its adhesion. In particular, if the insole stay in contact with liquids at high temperatures (eg: too hot thermal water).