The Go-Strap is a unique but simple adaption to the standard tennis elbow support to carry the load of the injured soft tissue. This is the only product on the market that offers this new adaption to an age old problem. It provides an unloading element to the common extensor tendon, primarily responsible for tennis elbow, in much the same way as a physiotherapist would look to unload through taping. This makes it an easy device to use as and when you are undertaking activities that aggravate your problem. This product comes in 3 sizes, when measuring please find the widest part of your forearm. Small 175 mm to 225 mm (7" to 9") Medium 225 mm to 275 mm (9" to 11") Large 275 mm to 325 mm (11" to 13") Hand wash in warm soapy water.