OluKai Men's Nui Leather Sandals/flip flops. These sandals are Full Grain leather, and feature a quick-drying jersey knit lining with a soft nylon toe post. The sandals are in good condition, with lots of life left in them. Tread life is exceptional. The footbed has slight toe outlines, with no actual indentations. These sandals are a Men's 11, however they fit more like a Men's 10. (runs small) Reviews online verify the sizing.