Mountain Biking shoe concept Nike + Furai = ? Form follows function. Inspired by the Mazda Furai the concept employs an upper of engineered PU. The sharp surfaces are designed so as to cut the air so as to increase the speed of air flow through the intakes and the forefoot inlets. Once the foot is cooled the warm air would exit through the counter outlet due to the pressure levels between the interior and exterior environments of the shoe.