Vionic 44 Wave Unisex Flip Flops Men's Size 11/ Women's Size 12 This unisex toe-post sandal features soft nylon webbing and our biomechanically designed footbed that hugs your arches and supports your feet in all-day comfort. 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. A durable TPR outsole with patterned tread helps improve traction. Materials: padded, jersey-lined upper Great Preowned condition