Price: $ MSRP: $

The Nike Free 4.0 Flyknit features deep flex grooves for exceptional flexibility and natural foot movement. It offers minimal cushioning and a semi-soft ride.


Important Shipping Note: U.S. sales only.


Get closer to natural with the nimble Nike Free 4.0 Flyknit. Featuring hexagonal flex grooves for exceptional heel-to-toe flexibility, this neutral shoe allows you to function naturally through the gait cycle. The Flyknit upper features dynamic Flywire around the midfoot for an adaptive fit, while a seamless design keeps your foot wrapped in socklike comfort. Lace up the Free 4.0 Flyknit as a foot-strengthening tool or as a performance oriented trainer.

Model Number:

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Weight: 7.4 oz (size 9)

Stack Height: Heel (20mm), Forefoot (14mm)

Available Widths: D=Medium 

How It Fits (based on width D)

  • Sizing: Standard running shoe length
  • Heel: Medium
  • Midfoot: Low to medium volume
  • Forefoot: Medium to narrow
  • Toe-Box Height: Low
  • Arch Structure: Medium
  • Shoe Shape: Curved


The Nike Free 4.0 Flyknit is a minimum featured, minimum neutral shoe designed for speedwork, racing, and daily training.


  • Phylite uses a lightweight midsole material designed for a resilient ride with enough durability to double as an outsole.


  • Phylite uses a lightweight midsole material designed for a resilient ride with enough durability to double as an outsole.
  • Nike Free sipes uses gender-specific flex grooves to allow barefoot-like flexibility and stability.
  • Transtarsal Flex Grooves are deep outsole cuts running diagonally under the midfoot area for increased flexibility and mobility.


  • Flyknit Upper features a one piece, overlay-free upper, resulting in a seamless and sock-like fit.
  • Asymmetrical lacing wraps the foot to the shoe and relieves pressure over the top ridge of the foot.
  • Molded sockliner mimics the curvature of the foot for a closer fit and underfoot cushioning.
  • Strobel Last with the upper stitched to full-length fabric for a comfortable underfoot feel.


  • Beveled Heel consists of a curved outer heel, to encourage midfoot and forefoot striking.
  • Waffle lugs built into the Phylite outsole compress on impact for increased cushioning. 
  • BRS 1000 carbon rubber provides durable traction.

Footwear Performance Characteristics

Pronation Control: What's This?

  • Neutral
    • Min
    • Mod
  • Support
    • Min
    • Mod
    • Max
  • Motion Control
    • Mod
    • Max

Heel-Toe Offset (mm): What's This?

  • 0
  • 1-2
  • 3-4
  • 5-6
  • 7-8
  • 9-10
  • 11+

Stack Height:

  • Barefoot
  • Minimal
  • Low
  • Medium
  • High
  • Maximal


  • Road
  • Road-Trail
  • Hard Trail
  • Varied Trail
  • Soft Trail

Shoe Type:

  • Premium
  • Standard
  • Performance
  • Racing

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