DonJoy Sacroiliac (SI) Joint Support Belt Made of a comfortable mesh material which is both durable and breathable, even during extended periods of use Low profile design makes the DonJoy Sacroiliac (SI) Joint Support Belt ideal to wear underneath clothing Silicone grip strips prevent the support brace from migrating and "locks" the hips Patented Mechanical Advantage Pulley System provides smooth and uniform compression, and allows you to customize the tension An easy to use pull handle allows you to quickly adjust the support brace to your desired level of comfort