Insta Slim The Original Proven Muscle Tank T-shirts now in a 3 Piece value pack. These unique sleeveless compression T-shirts will make you look up to 5" slimmer and pounds lighter Instantly. Always have one clean and ready to go. This compression t-shirt is made of a special blend of 72% nylon, 28% spandex fibers, making the garment comfortable to wear all day, every day. Can be worn for work or play, as an under garment or outerwear, to exercise and or enjoy a night out on the town. Must have for the man that always wants to look his very best.