Tide ii features the same great orthaheel technology and fit you've come to love and expect this iconic, best-selling style now features leather trim and an updated tread pattern. Soft woven toe post and foam-lined strap ensure a comfortable fit. Orthaheel 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. Woven/leather uppers with padded neoprene upper liner. Recommended by dr. Andrew weil. Received apma seal of acceptance.