The Mueller Jumper's Knee Strap applies uniformed pressure on the patella tendon just below your kneecap to help relieve pain during frequent running or jumping. It's ideal for helping relieve patellar tendonitis. Antibacterial treatment controls or eliminates odor. The AEGIS Microbe Shield antimicrobial treatment is intended to protect the brace against odor, staining and deterioration caused by bacteria and microorganisms. This treatment does not extend protection to the skin. This strap comes in one size that fits most.