Newly enhanced with a new Holofiber top cover, the Superfeet Performance Green Insole remains one of the most successful and sought-after sport insoles available today. Recently redesigned, Superfeet kept the same patented profile for support, balance and shock absorption while hiking, skiing and running, but replaced the top cover for improved circulation and better muscle recovery. Holofiber absorbs your IR light waves and reflects the energy back in a longer wavelength that can potentially relax body tissues. It might sound a little out there, but research indicates that Holofiber will increase tissue oxygen levels when placed next to skin. If IR benefits don't grab you, the unsurpassed fit in Superfeet Performance Green Insoles will. This is the only insole available with a rear-foot control point that helps control over-pronation, giving you less stress on your muscles and joints. This stabilization continues at the mid-foot for enhanced control and less muscle fatigue. The patented shape is easily trimmed to fit a wide range of footwear, although Superfeet recommends their Performance Green Insoles for looser-fitting hiking boots and running shoes.