Please Note: THE STYLE OF THE BLACK VEST IS A LOOSE FIT. You need to take one size SMALLER than your normal size if you want a slim fit (such as MS). Please purchase your waist grith before purchase, if you receive our sweat suit and are not satisfied with them, we guarantee a full refund or exchange. Premium & Comfy Materials: The sweat suit is composed of 15% Polyester + 70% Neoprene + 15% Nylon. The moisture-absorbing material allows it to absorb sweat while you're sweating, keeping your skin dry and providing better comfort. We recommend that you leave it in the air for 1-2 days after receipt to remove the smell of Neoprene material. Hand Wash Only Fastening: Zip Loose Easy to Wear: Normal sweat vests may be inconvenient to take off after you've worked out, but our gym tank top takes a zipper design, high stretch and quick drying fabric makes it easier to put on and take off, making exercising easier Shape Your Body: The quick shaping vest provides pressure on your body, especially helps strengthen your abs and pecs, helps you correct your power position, and makes your body slimmer and firmer. The mens sweat body shaper certainly a must-have for your workout gym clothing. Sweat Enhancer: This men's sauna suit can help you shape effectively and sweat quickly, make you sweat more and faster, burn your fat when exercising, quickly achieve your satisfactory exercise effect, and make your exercise more relaxed and pleasant, enjoy the movement of the body