The black supports are made of the highest grade neoprene, covered with stretch nylonon both sides for compression and heat retention, which helps improve bold circulation.This combination provides a therapeutic treatment to muscle and jointpain or injury. Its adjustable Velcro strap insures comfortable fit and stabilization. Neoprene is a stretchable, flexible and comfortable material, that holds heat in but lets moisture (sweat) out. You not only look good wearing them, but they also make you feel better by relieving muscular tension and fatigue through increased blood circulation as observed by clinical tests.
