Heat and stimulates sweating during exercise. Unnoticeable Under Clothes: fits seamlessly under all your clothes to give you the look you want, whenever you want. Perfect For All Occasions: Wear around the house, when you are exercising, running errands or going out. You will have a firmer posture, lower back support, and be sweating all day. Corrects Posture: Helps correct your posture - providing support for your lower back by tightening your midsection.