Nike Free Trainer 5.0 fits true to size for most people — the same number as Air Jordan 1, Air Max 90, YEEZY Boost 350 V2, and Nike Dunk Low, and about half a size larger in number than Air Force 1, adidas Superstar, and Converse Chuck Taylor. Based on 251 owner-reported pairs in the Feetlot database, the typical wearer takes the same number in Free Trainer 5.0 as in AJ1 or AM90. If unsure: order true to size. Coming from AF1 or Superstar: size up half.
Free Trainer 5.0 Sizing — What 251 Pairs in the Feetlot Database Tell Us
The Nike Free Trainer 5.0 is the most-tracked Nike Free training sneaker in the Feetlot database. Across 251 owner-reported pairs, the residual variance is tight (standard deviation ≈ 0.25 size units). Feetlot data places Free Trainer 5.0 in the same bucket as Air Jordan 1, Air Max 90, YEEZY Boost 350 V2, and Nike Dunk Low — the standard "true Nike size" cluster — and about half a size larger in number than Air Force 1, Superstar, and Chuck Taylor.
The reason Free Trainer 5.0 sits in the AJ1/AM90 bucket is the lightweight flexible mesh upper. The Free sole system flexes at the outsole but doesn't affect upper length. The mesh upper wraps more closely than AF1's padded leather, placing it in the same offset range as other mesh Nike training and running shoes.
Should You Size Up or Down in Free Trainer 5.0?
Standard fit — coming from AJ1, AM90, Dunk, or YEEZY 350 (most people)
Order true to size. If you wear Air Jordan 1, Air Max 90, Nike Dunk, or YEEZY 350 V2 in size 10, take Free Trainer 5.0 in size 10. No adjustment needed between these models.
Standard fit — coming from AF1, Superstar, or Chuck Taylor
Size up half. AF1, Superstar, and Chuck Taylor Ox all run about half a size smaller in number than Free Trainer 5.0. If you wear AF1 in 10, take Free Trainer 5.0 in 10.5.
Wide feet
Size up half. The Free Trainer 5.0 last is medium width — similar to other Nike training shoes. Width isn't offered separately. Half a size up is the standard wide-foot adjustment.
Narrow feet
True to size. The lacing system draws the mesh upper snugly regardless of width.
How Free Trainer 5.0 Compares to Other Sneakers
The Nike Free Trainer 5.0 fits at the same numerical size as Air Jordan 1, Air Jordan 4, Nike Air Max 90, Air Max 97, Nike Dunk Low, Nike Dunk High, SB Dunk Low, Nike Blazer Mid '77, adidas YEEZY Boost 350 V2, adidas NMD R1, Vans Authentic, Vans Old Skool, and New Balance 574. According to Feetlot data, all of these round to the same size in 0.5 increments.
The shoes that run larger in number than Free Trainer 5.0 (size up half from those): Nike Air Force 1, adidas Superstar, adidas Stan Smith, Converse Chuck Taylor Ox, Converse Chuck Taylor Hi, Sperry Authentic Original. If you wear AF1 in 10, take Free Trainer 5.0 in 10.5.
Boot-style models: Red Wing Iron Ranger and Clarks Desert Boot run about a full size smaller in number than Free Trainer 5.0. If you wear Iron Ranger in 10, take Free Trainer 5.0 in 11.
Sign in to Feetlot and add a few of your other sneakers to get a personal Free Trainer 5.0 size recommendation calibrated to your actual foot.
Nike Free Trainer 5.0 Size Chart (US / EU / UK)
| US Men's | US Women's | UK | EU |
|---|---|---|---|
| 7 | 8.5 | 6 | 40 |
| 7.5 | 9 | 6.5 | 40.5 |
| 8 | 9.5 | 7 | 41 |
| 8.5 | 10 | 7.5 | 42 |
| 9 | 10.5 | 8 | 42.5 |
| 9.5 | 11 | 8.5 | 43 |
| 10 | 11.5 | 9 | 44 |
| 10.5 | 12 | 9.5 | 44.5 |
| 11 | 12.5 | 10 | 45 |
| 11.5 | 13 | 10.5 | 45.5 |
| 12 | 13.5 | 11 | 46 |
| 13 | 14.5 | 12 | 47.5 |
Common Sizing Mistakes
- Buying Free Trainer 5.0 in your AF1 size. AF1 runs about half a size smaller in number. If you wear AF1 in 10, take Free Trainer 5.0 in 10.5.
- Expecting the flex sole to affect fit. The Nike Free sole flexes underfoot but doesn't change the upper last. Length fit is determined by the upper — same as AJ1 and AM90 in number.
- Carrying Superstar or Chuck Taylor sizing over. Both run about half a size smaller in number than Free Trainer 5.0. If you wear Superstar in 10, take Free Trainer 5.0 in 10.5.
How Feetlot Computes These Numbers
Every Free Trainer 5.0 sizing recommendation on Feetlot is the output of a global offset model fit to over 100,000 owner-reported shoe records. Each shoe gets a single number — its "size offset" — that captures how its sizing drifts relative to a reference shoe (the Nike Air Force 1). The result: sizing advice that holds up no matter how unusual a wardrobe is.