LOSE WEIGHT FASTER! This adjustable waist trimmer retains heat in your core area with our sauna inner lining, accelerate your sweat and allow you to lose more calories. INCREASED Ab & BACK SUPPORT - The compression of the waist trimmer provides extra support for your lower back and helps you exercise safe lifting techniques. COMFORTABLE FIT - Made out of Japan imported ANTI-PILLING OK fabric with strong adhesiveness. It contoured to comfortably fit around your waist, experience sweat high flexibility for every movement during your workouts (Yoga, Running, Boxing, rope skipping etc.) FRONT SMARTPHONE POCKET DESIGN: Add the smartphone pocket in front to let you enjoy your music in every workout moment. You also can put key, card, rope and etc. , the OK fabric definitely keep your things safe inside.