UNDEFEATED X AIR JORDAN 4 RETRO 2025
Every pair on Project Sneakers is listed in UK sizing. Use the charts below to convert to EU and US for your chosen brand — sizing runs slightly differently between brands, so always check the right table.
Nike & Air Jordan
Jordan uses the same sizing as Nike. Nike tends to run slightly narrow.
| UK | EU | US | Foot length |
|---|---|---|---|
| UK 5.5 | EU 38.5 | US 6 | 23.7 cm |
| UK 6 | EU 39 | US 6.5 | 24.1 cm |
| UK 6 | EU 40 | US 7 | 24.5 cm |
| UK 6.5 | EU 40.5 | US 7.5 | 25.0 cm |
| UK 7 | EU 41 | US 8 | 25.4 cm |
| UK 7.5 | EU 42 | US 8.5 | 25.8 cm |
| UK 8 | EU 42.5 | US 9 | 26.2 cm |
| UK 8.5 | EU 43 | US 9.5 | 26.7 cm |
| UK 9 | EU 44 | US 10 | 27.1 cm |
| UK 9.5 | EU 44.5 | US 10.5 | 27.5 cm |
| UK 10 | EU 45 | US 11 | 27.9 cm |
| UK 10.5 | EU 45.5 | US 11.5 | 28.3 cm |
| UK 11 | EU 46 | US 12 | 28.8 cm |
| UK 11.5 | EU 47 | US 12.5 | 29.2 cm |
| UK 12 | EU 47.5 | US 13 | 29.6 cm |
| UK 12.5 | EU 48 | US 13.5 | 30.0 cm |
| UK 13 | EU 48.5 | US 14 | 30.5 cm |
adidas & Yeezy
adidas runs about a half-size different to Nike and fits a touch wider.
| UK | EU | US | Foot length |
|---|---|---|---|
| UK 5 | EU 38 | US 5.5 | 23.3 cm |
| UK 5.5 | EU 38 2/3 | US 6 | 23.8 cm |
| UK 6 | EU 39 1/3 | US 6.5 | 24.2 cm |
| UK 6.5 | EU 40 | US 7 | 24.6 cm |
| UK 7 | EU 40 2/3 | US 7.5 | 25.0 cm |
| UK 7.5 | EU 41 1/3 | US 8 | 25.5 cm |
| UK 8 | EU 42 | US 8.5 | 25.9 cm |
| UK 8.5 | EU 42 2/3 | US 9 | 26.3 cm |
| UK 9 | EU 43 1/3 | US 9.5 | 26.7 cm |
| UK 9.5 | EU 44 | US 10 | 27.1 cm |
| UK 10 | EU 44 2/3 | US 10.5 | 27.6 cm |
| UK 10.5 | EU 45 1/3 | US 11 | 28.0 cm |
| UK 11 | EU 46 | US 11.5 | 28.4 cm |
| UK 11.5 | EU 46 2/3 | US 12 | 28.8 cm |
| UK 12 | EU 47 1/3 | US 12.5 | 29.3 cm |
| UK 12.5 | EU 48 | US 13 | 29.7 cm |
| UK 13 | EU 48 2/3 | US 13.5 | 30.1 cm |
ASICS
Generally true to size.
| UK | EU | US | Foot length |
|---|---|---|---|
| UK 6 | EU 40 | US 7 | 25.0 cm |
| UK 6.5 | EU 40.5 | US 7.5 | 25.5 cm |
| UK 7 | EU 41.5 | US 8 | 26.0 cm |
| UK 7.5 | EU 42 | US 8.5 | 26.5 cm |
| UK 8 | EU 42.5 | US 9 | 27.0 cm |
| UK 8.5 | EU 43 | US 9.5 | 27.5 cm |
| UK 9 | EU 44 | US 10 | 28.0 cm |
| UK 9.5 | EU 44.5 | US 10.5 | 28.5 cm |
| UK 10 | EU 45 | US 11 | 29.0 cm |
| UK 10.5 | EU 45.5 | US 11.5 | 29.5 cm |
| UK 11 | EU 46.5 | US 12 | 30.0 cm |
| UK 12 | EU 47.5 | US 13 | 31.0 cm |
New Balance
True to size, available in multiple widths (D is standard).
| UK | EU | US | Foot length |
|---|---|---|---|
| UK 6.5 | EU 40 | US 7 | 25.0 cm |
| UK 7 | EU 40.5 | US 7.5 | 25.5 cm |
| UK 7.5 | EU 41.5 | US 8 | 26.0 cm |
| UK 8 | EU 42 | US 8.5 | 26.5 cm |
| UK 8.5 | EU 42.5 | US 9 | 27.0 cm |
| UK 9 | EU 43 | US 9.5 | 27.5 cm |
| UK 9.5 | EU 44 | US 10 | 28.0 cm |
| UK 10 | EU 44.5 | US 10.5 | 28.5 cm |
| UK 10.5 | EU 45 | US 11 | 29.0 cm |
| UK 11 | EU 45.5 | US 11.5 | 29.5 cm |
| UK 11.5 | EU 46.5 | US 12 | 30.0 cm |
| UK 12 | EU 47 | US 12.5 | 30.5 cm |
| UK 12.5 | EU 47.5 | US 13 | 31.0 cm |
UGG — Women's
| UK | EU | US | Foot length |
|---|---|---|---|
| UK 3 | EU 36 | US 5 | 22.0 cm |
| UK 3.5 | EU 36.5 | US 5.5 | 22.5 cm |
| UK 4 | EU 37 | US 6 | 23.0 cm |
| UK 4.5 | EU 37.5 | US 6.5 | 23.5 cm |
| UK 5 | EU 38 | US 7 | 24.0 cm |
| UK 5.5 | EU 38.5 | US 7.5 | 24.5 cm |
| UK 6 | EU 39 | US 8 | 25.0 cm |
| UK 6.5 | EU 39.5 | US 8.5 | 25.5 cm |
| UK 7 | EU 40 | US 9 | 26.0 cm |
| UK 7.5 | EU 40.5 | US 9.5 | 26.5 cm |
| UK 8 | EU 41 | US 10 | 27.0 cm |
| UK 8.5 | EU 41.5 | US 10.5 | 27.5 cm |
| UK 9 | EU 42 | US 11 | 28.0 cm |
UGG — Men's
| UK | EU | US | Foot length |
|---|---|---|---|
| UK 5 | EU 39 | US 6 | 24.0 cm |
| UK 5.5 | EU 39.5 | US 6.5 | 24.5 cm |
| UK 6 | EU 40 | US 7 | 25.0 cm |
| UK 6.5 | EU 40.5 | US 7.5 | 25.5 cm |
| UK 7 | EU 41 | US 8 | 26.0 cm |
| UK 7.5 | EU 41.5 | US 8.5 | 26.5 cm |
| UK 8 | EU 42 | US 9 | 27.0 cm |
| UK 8.5 | EU 42.5 | US 9.5 | 27.5 cm |
| UK 9 | EU 43 | US 10 | 28.0 cm |
| UK 9.5 | EU 43.5 | US 10.5 | 28.5 cm |
| UK 10 | EU 44 | US 11 | 29.0 cm |
| UK 10.5 | EU 44.5 | US 11.5 | 29.5 cm |
| UK 11 | EU 45 | US 12 | 30.0 cm |
| UK 12 | EU 46 | US 13 | 31.0 cm |
- Low stock - 1 item left
- Backordered, shipping soon
- 100% authentic — every pair verified in-house before it ships
- Fast UK tracked delivery — next-day options at checkout
- Free 30-day returns & exchanges
The Undefeated x Air Jordan 4 Retro arrives as a refined collaboration between two pillars of sneaker culture. This iteration of the iconic silhouette maintains the architectural integrity of the original—clean lines, prominent mesh panelling, and the signature wing support system—whilst presenting a carefully considered colourway that nods to the partnership's shared aesthetic.
Built for those who appreciate understated excellence, this release represents a meeting point between heritage design and contemporary sensibility. The result is a shoe that commands respect through substance rather than statement.
Every pair is brand new and unworn, supplied in its original box. Nothing we sell is used, worn or ex-display — just deadstock, ready to wear.
Every pair is verified 100% authentic in-house before it ships — checked against known-authentic references for materials, stitching, labelling and box details.
Fast UK tracked delivery, with next-day options at checkout. Orders are dispatched securely and double-boxed to protect the shoe box in transit.
Not the perfect fit? Enjoy hassle-free 30-day returns & exchanges. Full details on our Shipping Policy.
