Is the original, racy, thong style sandal with thin, flexible straps that move with you, for both ladies and men (unisex). Monte Carlos also have Sensi's patented, built-in drainage and filtration system for water/sand/soap. This circulates air underfoot, keeping feet cool and dry on a slip-resistant and non-marking sole. All Sensi Sandals are antibacterial/anti-fungal and machine washable. No moisture build-up which prevents mold, bacteria or mildew from growing, resulting in dry, comfortable, healthy and odor-free feet! Your forever, waterproof flip-flop.