Metal stay on top & bottom of brace helps protect the wrist from movements that can lead to Carpal Tunnel Syndrome. * Increases circulation to aid in the treatment of RSI and tendonitis. * Clinically proven to increase your temperature at the affected area ~3 degrees, for the optimal level of heat therapy. * Patented Trioxon lining maintains elevated temperature while wicking away moisture for comfort * Trioxon lining is soft against your skin and allows air to reach your skin for maximum comfort.