Reef Mens Rover Sandal/Flip Flops/Slipper Footwear, Charcoal/Blue Pop, Size 11 Synthetic nubuck upper Made in USA or Imported 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