Nope, 'fraid not sir, there is no law against wearing sandals with a tuxedo. The Sanuk Fraid Not excels in any situation where comfort and cool are at the top of the list. This sandal features a super-soft, high-rebound EVA footbed with a premium suede sockliner for unbelievable comfort. The Happy U outsole cushions every step. The frayed canvas strap combines with a super-comfy terrycloth liner for a chill, laid-back look. Wt. 5.2 oz.