The Slimming Shaper Racer Back Tanks are made with thermal material that promotes weight loss/size reduction. Lose weight – maximize your workout efforts when you wear these. The Material is lightweight and breathable, yet will raise your core temperature and increase your sweat output. Wear them while you exercise or just while you go about your day to help slim your waist, tummy and back. Black – Pink – Green – Purple – Blue Small – Medium – Large – XL Care: Hand wash in cold water with mild detergent. Gently squeeze out and dry flat.