The Vionic is the world's first orthotic sandal. Iconic support and style make it a best-selling favorite; meet your new comfy, contoured go-to. Tide II features Vio-Motion Support with a fit you've come to love and expect! This iconic, best-selling style now features leather trim and an updated tread pattern. Proven to effectively alleviate heel pain. Soft woven toe post and foam-lined strap ensure a comfortable fit. Vionic Technology is biomechanically designed to hug your arches and support your feet in comfort. Vionic sandals' built-in orthotic is shown to be effective in helping to treat heel pain (plantar fasciitis). Lightweight, flexible medium-density EVA midsole absorbs shock, reducing stress on feet, ankles and knees. Durable TPR outsole with patterned tread helps improve traction. Upper: Leather and Textile or Natural Cork and Textile or Synthetic and Textile. For the greatest comfort, we recommend wearing your new Vionic footwear or orthotics 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. New with box.