Sandals for men are ideally made of leather, rubber, suede, and you can wear them with various casual outfits. OluKai is a premium footwear manufacturer based out of the US. The brand caters to men and women across age groups. Recently, OluKai signed Matt Ortiz, Kimi Werner, Kamu Davis, and Roxy Ortiz as its brand ambassadors. Mustard often represents cheerfulness and warmth as it is a yellow color family.