The Swimmer design is based on the original Salt-Water featuring a plaited leather upper with buckle Water featuring a plaited leather upper with buckle ankle strap. The differences are the Swimmer has a ankle strap. The differences are the Swimmer has a slightly narrower fitting and, like all Sun-San Sandals, the Swimmer comes on a spongy urethane sole with rust proof buckles. They can also be worn in water and hand-washed with a gentle detergent.