Pro Sauna Shirt™ is designed to help you sweat more during training. Built with an upgraded 3-layer fabric system, it traps body heat to support heavier perspiration and higher workout intensity. It feels like a normal performance t-shirt on the outside, but works as heat-trapping gear on the inside — helping your body work harder while allowing full freedom of movement. Key Benefits Built to make you sweat: Designed to retain body heat and stimulate heavier perspiration during physical activity. Supports higher calorie burn: Increased heat and sweating help support greater energy output during workouts. Upgraded 3-layer performance fabric: Engineered to trap heat while staying smooth, flexible, and comfortable on the skin. Feels like real sportswear: Advanced KFIT® fabric delivers a soft, wearable feel instead of a stiff, sauna-suit texture. Less restrictive, more freedom: Updated construction moves naturally with your body for high-movement training. Athletic performance fit: True-to-size t-shirt designed to feel better across a wider range of body types. Note: Exercise and a balanced diet are essential parts of any fitness routine. Kewlioo products are designed to s