waist trimmer trainer belt for women men sport sweat workout body shaper sauna m black mermaid's mystery maximize your workouts and look great at the same time. mermaid's mystery sauna waist trainer belt reduces 1-3 inches from your waistline which instantly sculpts an hourglass silhouette. with an easy-on velcro design, the waist slimmer belt is adjustable to ensure a perfect fit anytime. thanks to hot thermo neoprene fabric, you will sweat more like sauna in your core midsection with less effort, muscle toning, housework, gym exercise, running. it is also an excellent choice of back support with 4 bones around.