The Superfeet Green Premium is a high-tech sole insert that fits into most shoes and boots to provide optimal cushioning, support and all-day comfort. Built with Superfeet's Foundation cross-linked polyethylene foam, this insert delivers anatomical support to areas of the foot affected most by fatigue and overexertion. There is an internal Agion coating on all Superfeet insoles that prevents the growth of odor-causing bacteria and promotes a healthy, dry and cool interior. The Encapsulating Stabilizer System offers underfoot support in the form of a contoured heel cup, promoting optimal shock absorption and energy return. Perfect for replacing worn insoles or adding a layer of comfort to reliable work footwear, Superfeet has engineered these insoles for maximum performance.