The Vionic Ngage 1.0 Lace-Up Sneaker was developed with synergy in mind, with its insole, midsole, and outsole engineered in to a single dual-density unit for improved dynamic function. Memory foam lines the insole for instant comfort, and 1st Ray technology facilitates improved flexibility beneath the first metatarsal. Manmade and textile upper Footbed/outsole: co-molded proprietary EVA compound with rubber outsole Recommended by Dr. Andrew Weil U.S. patent pending. Vionic brand's biomechanical technology is shown to be an effective treatment for heel pain. Vionic brand's biomechanical footbed supports you from the ground up. By building biomechanical technology into premium footwear, Vionic brings together the best of science and style. For the greatest comfort, we recommend wearing your new Vionic footwear for just a few hours for the first few days to allow your feet to adjust to the new level of orthotic comfort and support. Within one to two weeks you should find the product completely comfortable and supportive. Vionic Natural Alignment.