EXCEPTIONAL NATURAL FLEXIBILITY
More flexible than the 5.0 and more cushioned than the 3.0, the Nike Free 4.0 Flyknit Men's Running Shoe unleashes your natural stride with a lightweight, supportive Flyknit upper and highly flexible, low-profile outsole.
The Flyknit upper-a one-piece layer made entirely of polyester yarn-seamlessly integrates areas of stretch and structure, providing ultralight support and a contoured fit. Knit-in Flywire cables cradle the midfoot for enhanced support where you need it most.
New hexagonal flex grooves are hot-knife cut into the outsole and wrap around the sidewall so your foot moves more naturally in every direction. Secondary cuts intersect the flex grooves, adding even more flexibility.
The heel mimics the shape of the foot, rolling with the ground to promote a more natural footstrike.
With a 6mm difference between heel and forefoot height, the Nike Free 4.0 Flyknit gets you closer to the ground for a more natural feel while still offering a great blend of cushioning and support.
- Attached Nike Flyknit tongue with notches for easy entry
- Minimal sockliner molds to your foot's curvature for added support and comfort
- Non-stretch, knit-in heel for structure and support
- Asymmetrical lacing for reduced lace pressure on the top of your foot
- Waffle outsole lugs help absorb impact and add responsiveness
- Weight: 238 grams (men's size 9)
Nike Free Origins
After learning that Stanford athletes had been training barefoot on the university's golf course, three of Nike's most innovative and creative employees set out to develop a shoe that felt natural and weightless, similar to bare feet. In 2002, they examined a group of men and women with pressure measuring insoles taped to their feet, using high-speed cameras to capture images of each foot in motion.
The team spent eight years studying the biomechanics of shoeless running. The results yielded a profound understanding of the foot's natural landing angle, pressure and toe position, allowing Nike designers to build an unconventional and flexible running shoe from the inside out. Since Nike Free's introduction, millions of runners have trained in the shoe, including some of Kenya's world-class runners.
Nike Flyknit technology was inspired by feedback from runners craving a shoe with the snug (and virtually unnoticed) fit of a sock. Nike embarked on a four-year mission with teams of programmers, engineers and designers to create the technology needed to make the knit upper with static properties for structure and durability. Then the precise placement of support, flexibility and breathability-all in one layer-was refined. The result is a featherweight, form-fitting and virtually seamless upper.
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- Delivery and Returns
METHOD TIME COST SERVICE SPRINT Next working day FREE on orders over £100
(£6 for orders up to £100)
RUN 2-3 working days FREE on orders over £50
(£3 for orders up to £50)
CLICK & COLLECT (Glasgow) 1-2 Working days FREE SATURDAY DELIVERY 1 working day £12 Royal Mail
Orders received before 2pm (Monday-Friday) are processed on the same day - after 2pm orders will be processed on the next working day.
Click & Collect
Collect your order in person from the achilles heel Glasgow running shop. Orders placed before 2pm will be available for collection on the next working day; orders placed after 2pm will be available for collection in 2 working days. Orders placed over the weekend will be available for collection on the Tuesday.
As soon as your order is ready for collection we will email to let you know. When you collect your order please ensure you bring your order confirmation & identification.
We'll package and post your order to most locations across the world as quickly as we can - for full details of delivery charges for international orders check our delivery charges page.
Spend £200+ and get FREE EU delivery.
At achilles heel we aim to please, so if you're not completely satisfied with your order, we'll do whatever we can to make it better. Items can be returned for free for an exchange or a refund within 28 days of purchase - we offer free & easy tracked returns via Royal Mail, for full details please check our returns page.
It can be hard to get things right so we are giving 28 days from Christmas Day to return your gifts on all orders made during November and December. Our returns policy will revert to the standard 28-day period for items purchased after December 31st.