The sleeves in the Smart Sleeve Set (Knee/ Elbow/ Ankle/ Wrist) are made with Far Infrared fiber combined with GIA’s proprietary blend of Energy Resonance Technology (ERT). These technologies paired provides a warming relief, as well as optimal joint support. Researchers have noted that Far-Infrared transfers energy purely in the form of heat, which can be perceived by the thermo-receptors in human skin as soothing warmth that can penetrate up to 1.5 inches beneath the skin. We are revolutionizing the way biofield-reinforcing frequencies are utilized by the body’s energy field so that you can experience extraordinary results! (Contains latex)