All this and brains too. Our Trakk II toe-thongs are classic and casual with a seamless upper. They^re handsome, easy to adjust, no-nonsense and built on our brilliant biomechanist-developed microwobbleboard midsoles. Now available with a soft, nylon upper, this toe-thong has ergonomics you^ll feel in every step. Upper:Leather *Technology:Microwobbleboard *Footbed Technology Launched in our very first sandal ten years ago, our patent-pending, triple-density Microwobbleboard midsole was engineered by two pioneering British biomechanists.