Women's Vionic Marcella Heeled Sandals This block-heel sandal brings dressy height together with the kind of comfort you can rely on for long events. A sleek upper and adjustable strap hold the foot securely, while the open-toe design keeps things airy. Underfoot, a contoured footbed with arch support and cushioning helps maintain balance and relieve pressure as you move. The sturdy block heel and stable platform pair with a durable outsole to keep each step confident and steady.