Reef Twinpin Men's Sandals. Looking good and keeping it basic is what the Reef Twinpin, a simple flip-flop, is all about. It features a soft Vegan leather upper and a Jersey lining for the ultimate comfort and style. These men's sandals also have a Reef-flex triple density EVA construction that is lightweight, while still offering anatomically correct arch support and features a durable and grippy molded high-density EVA outsole.