As one of the most popular back brace, this very comfortable NeoTech Care lower back belt provides a maximum level of support. It has cool breathable side panels, and firm elastic side pulls that provide adjustable compression. It is an ideal protection during contact sports, heavy-duty work or bodybuilding. Its special design allows you to be engaged in full body motions without feeling uncomfortable. It is made of a deluxe mesh, high-elasticity nylon fabric and has PP stripes distributed evenly in order to disperse the force the vertebrae undertake. Sizes (length): when measuring size please measure around the area where you will put the back support belt, usually around the belly button (please refer to product picture showing how to measure). S (belly under 31 inches/78 centimeters), M (belly: 30-34 inches/ 76-86 centimeters), L (belly: 33-36 inches/ 84-91 centimeters), XL (belly: 35-38 inches/ 89-96.5 centimeters), XXL (belly: 38-41.5 inches/ 96.5-105 centimeters). Width of 22 centimeters for all sizes.