This is a free-size knee support made of breathable mesh material that provides firm knee support and also has a warming effect. I have used it a few times, but it has been washed. - Brand: Luck - Model Name: Far Infrared Sports Mesh - Size: Free Size (Knee circumference 33cm-43cm) - Purpose: Knee Support - Features: Breathable mesh material - Function: Support and warming effect Thank you for looking.