Our DXT Comfort Footbed helps reduce knee stress If your feet could design their own insoles, the DXT Comfort insole would be it. Its TPU X design support stabilizer cup and extra heel shock absorber protect feet from slippage and jarring. A layer of slow-rebound memory foam conforms to your foot-shape every time you step in. And the X-Static lining keeps your feet fungal-free and feeling as fresh and cool as a summer breeze. Treat your feet to DXT Comfort.