The arm wraps stimulate sweat release, and help to reshape your upper arm It can also help protect arm musles while you are doing physical exercises Fit for multiple occasions, such as yoga, gym, sports, body building, ball games and so on Special 3-layer design, creats strong sauna effect, accelerating and sweating, and keeps the outer layer dry in the same for time This arm trimmer is contoured to fit around your arm comfortably and is naturally flexible to allow for a full range of motions neoprene thermal, it is snug to wear, effectively enhances perspiring and burns more calories