Scientific Design for Better Muscle Growth The BFR (Blood Flow Restriction) booty bands help human's muscle growth better by temporarily restricting blood flow into the muscles, accumulating lactic acid and HGH (human growth hormone) like giving a pump. Glutes & hip build faster and better with less exercise. Make good and healthy body shape. Wide Usage For Various Exercise Exercise bands are ideal for assisting for both women and men. Can be used for yoga, pilates, barbell, squat, equipment training and beach body workouts. it works for different body parts such as Arms, Legs, Butt, Thigh, Glutes, Hip. Special Buckle With Cramp Ring Design This Occlusion Resistance Bands is designed with a light and special buckle which can tighten the bands well, it won't get loose and no moving. And with extra cramp ring, it collect the bands well, Do not chafe skin while workout. Adjustable and Easy to Use & Carry The BFR resistance bands size is length 35.4' and width 2'. They are adjustable for different sizes of women and men, And the portable booty resistance bands are Easy to Use & Carry in anywhere, home, gym, outdoors or travel. Long Lifetime without Loosening The Blood Flow Restriction Bands are made by high-class thick densified fabric with strong elasticity. Improve exercise effect by high resistance, and even using for long time, it will keep good elasticity without loosening.