Nike Free 4.0 running shoes are available with Flyknit fabric. The shoes come in models for both men and women and range in size and color.
Flyknit fabric provides a durable, formfitting and featherweight shoe, and Nike uses it in the Nike Free 3.0, 4.0 and 5.0 running shoes. The former offers the most flexibility, while the latter two increase cushioning with 6-millimeter and 8-millimeter offsets, respectively. The shoes include Flywire technology knitted directly into the upper. Nike Free 4.0 Flyknit running shoes are available from sporting and shoe retailers such as Sports Authority, Road Runner Sports and Finish Line as well as online at Amazon.com.