This Neotech Care elbow support sleeve utilizes a special knitting radial compression technology, which increases the support provided to the elbow but not the feeling of tightness. The high quality fabric of this elbow brace makes it very comfortable to wear and lets your skin in the elbow area breathe. It is ideal for those who need gentle elbow support while keeping flexibility. This protecting elbow sleeve provides focal support to the elbow joint and surrounding muscles. This elbow brace is made of high quality fabric that is comfortable to wear. Made of 20 percent nylon, 50 percent polyester and 30 percent spandex and this model works well for either elbows. SIZES Please measure circumference at the elbow joint S: 20-23cm (8 inches to 9 inches) Length: 19cm (7.5 inches) M: 23-26cm (9 inches to 10.25 inches) Length: 19cm (7.5 inches) L: 26-29cm (10.25 inches to 11.5 inches) Length: 19cm (7.5 inches) Measurements can vary slightly depending on measurement method: +/- 0.5cm (+/-0.25inch) Please also keep in mind when choosing the size that the fabric is stretchable.