This is the Nike Free Run+ 2 Shoes,the new product of Nike Free.The style is similar with the Nike Free Run+ Running Shoes.The leather is durable and fashion.Nike Free is technology invented by Tobie Hatfield at Nike,Inc. and developed in conjunction with Gerard Hartmann and incorporated into some of their athletic shoes.Nike Free attempts to simulate barefoot running while wearing a shoe.As this shoe allows the muscles in the foot to gain strength by providing less constriction,runners are advised to gradually break into the shoe rather than immediately running long distances as to prevent muscle cramps and other discomforts,such as the notorious shin splints.In 2006 Nike released a new version of the shoe,the Nike Free 5.0 V2,that addressed some of the durability issues in the earlier model.Among other changes,the heel and sidewalls of the shoe were redesigned to prevent tearing.Since then,the Nike Free 5.0 V3 (2007) and Nike Free 5.0 V4 (2009) models have been released along with various other models from the Nike Free 3.0 V1 and V2 to the Nike Free 7.0 V1 and V2.