UA RUSH infrared technology restores the body's energy to support your performance and faster recovery. Ultra-thin and lightweight material that you can hardly feel on your foot. The material wicks away sweat perfectly and dries very quickly. Integrated arch support helps reduce foot fatigue. Strategic mesh panels for better breathability where it's needed most. Seamless-free toe cap for a comfortable fit without bruising/chafing. Customized heel contours for a better fit to your foot. Specific construction for left and right foot. Delivery includes 1 pair of socks. Celliant technological textile.