Reef Mens Rover Sandal/Flip Flops/Slipper Footwear, Charcoal/Blue Pop, Size 12 Synthetic nubuck upper Rubber sole Comfort: Super soft contoured foam footbed for instant comfort Support: Medium density molded foam midsole for long-lasting support Reef Rover Sandal/Flip Flops/Slipper Footwear for Men Water friendly synthetic nubuck upper Synthetic nubuck upper. Rubber outsole