Gurus Men's Sustainable Sandals Natural Rubber Flip Flops Natural rubber sole, strap and post Imported Rubber sole Unique, stylish, comfortable flip flop Soles cushion every step and will form to your feet over time Sustainably sourced from rubber trees Straps adjust to various ankle width and foot sizes by twisting Sizing note: our flip flops run a half size small. For example if you wear an 11.5, we recommend sizing up to the 12/13. See size chart image for more information.