The DonJoy Sacroiliac (SI) Joint Support Belt provides stabilization of the sacroiliac joint through direct compression. The silicone grip strips prevent the support brace from migrating and "locks" the hips. It's made of a comfortable mesh material which is both durable and breathable, even during extended periods of use. The patented Mechanical Advantage Pulley System provides smooth and uniform compression, and allows you to customize the tension for a more effective treatment. With use, it helps reduce pain from everyday activities like walking and sitting. The easy to use pull handle enables you to quickly adjust the support brace to the desired level of comfort. A Velcro closure allows for easy application and removal. The low profile design makes the DonJoy Sacroiliac (SI) Joint Support Belt ideal to wear underneath clothing.