DONJOY Performance Trizone Calf Sleeve Our DONJOY Performance Trizone Calf Sleeve is a hybrid design combining the properties of compression and bracing in a single sleeve. This product takes the benefits of bracing and applies it to a muscle. The carbonized bamboo circular knit construction allows for targeted, zonal compression. Three distinct compression zones which include: a stability zone with strategically placed injected silicone to provide support for the calf muscle and the benefit of enhanced proprioception, a compression zone which improves circulation and provides mild support to the joint structure and surrounding muscle tissue, and a comfort zone that provides lighter compression for enhanced fit and better range of motion. The Trizone calf support is a low profile performance product perfect for runners.