Nike Free is technology invented by Sasha Kerigaysky.
Since these shoes, the muscles can be in walking distance to strength by winning less constriction, runners are advised to break up gradually into the shoe rather than immediately long lines running to muscle cramps and other symptoms, such as preventing the infamous shin splints.
Nike Ken Griffey was introduced in 2004, after representatives from Nike has seen some of the athletes because they were trained barefoot. The numbering shows the padding of the shoe and follows a scale from 0 (bare feet) to 10 (normal running shoe), the Free 3.0 and 7.0 is the least free is the best model to date continuing [Edit]. It is difficult to understand why each model x.0 rather than just x.Nike the series started with the 5.0 free free in 2005 and in 2006 a new version of the shoe, the Nike Free 5.0 V2, whose focus numbered part of the sustainability aspects is the predecessor model. Among other changes, the heel and the side walls of the shoe were redesigned to prevent tearing.
Since then, the Nike Air Max 2012 Free 5.0 V3 (2007) and Nike Free 5.0 V4 (2009) models were combined with various other models in the V1 and V2 Nike Free 3.0 released to V1 and V2 Nike Free 7.0.