Enhance the effectiveness of your workout with the KeepFit Waistband. It's made of soft neoprene which helps promote sweating so you can burn additional calories and provides extra core support. It's adjustable to fit any waist up to 60", so you can continue to use it even after you lose weight. Wear it under or over your workout clothing whenever you feel the need to trim down that unwanted belly fat. This sweatband also helps to strengthen your abdominal muscles.