The Back on Track + Physio products is designed to provide a comfortable four-way stretch. Intended for daily use by people with an active lifestyle, the Nikki Socks are made with our state-of-the-art Welltex technology, which is infused into the fibers of the socks. Welltex technology works to reflect your body’s energy, creating a soothing far-infrared thermal effect. This effect can help to increase blood circulation and provide relief to tired and sore muscles, tendons, ligaments, and joints. The Physio Nikki Socks should be used by active people who experience discomfort in their muscles, tendons, ligaments, and joints due to overuse, general exercise, or common injuries such as ankle sprains, shin splints and any conditions that decrease blood flow in your legs. The Nikki Socks feature increased support in the heel and toe areas with the remaining area being thin enough to fit underpants and boots.