These two-bar sandals boast clean classic lines, softly padded uppers, and they stay on, thanks to the adjustable quick-stick backstrap. The shoes feature Fitflop's ergonomic all-day comfortable Microwobbleboard midsoles. The shoe materials include soft, water-resistant neoprene, so drops of water roll off your sandals and your sandals dry faster if drenched. Launched in Fitflop's very first sandal in 2007, their patent-pending, triple-density Microwobbleboard midsole was engineered by two pioneering British biomechanists.Delivering extraordinary comfort, it not only helps absorb shock but can also diffuse underfoot pressure, by instantly increasing the contact area of the foot to the midsole.