【Physical Therapist Supervised Powerful Lumbar Supporter】Built-in with 4 metal plates and 2 spring plates in the lumbar area. Supports by lifting upwards. The sides and abdomen are firmly secured with elastic belts. Supports the lower back from all 360 degrees. Ideal for supporting strenuous movements such as standing for long periods, sitting for long periods, and bending forward. 【Excellent Support with Double Belts】The supporter is secured with a large velcro strap on the front. Lightly pull to the left and right before fastening to raise the lumbar area and secure it firmly. An elastic belt is then used to further secure it, holding the lower back with a double layer. Both are velcro, making it easy to fine-tune the tightness and to put on and take off. It stretches well and fits around the waist. 【Breathable Material】The lumbar area is made of mesh material. The side parts are made of breathable elastic bands. It effectively wicks away sweat and suppresses unpleasant odors. You can use it comfortably even in hot weather or when sweating during exercise like walking. 【Thin and Lightweight Under Clothing】Reduces strain on the lower back during work, housework, caregiving, sports, etc. Can be worn under clothing and is not noticeable. 【Product Details】● Applicable Size S: 66-75cm ● Color: Black ● Materials: Nylon, Polyester, Polyurethane, Metal ● Washing Instructions: Hand wash in water at 30 degrees Celsius.