Sizing is the question we get asked about the Nike P-6000 more than any other. It is a trainer built on an older running silhouette, and that older shape does not fit the way a modern bulky trainer does. The short answer is that the P-6000 fits true to size for most people, but the toe box runs slightly narrow, so a wide foot needs half a size up. This guide explains what that actually means in practice before you order from the Nike trainers range.
The reason the question comes up at all is the shape of the upper. The P-6000 is low and long, with a mesh base and synthetic overlays layered on top. Those overlays give the shoe its retro-running look, but they also hold the front of the shoe in a narrower profile than a knitted or stretch upper would. Length is rarely the problem. Width across the ball of the foot and the toes is where people notice it.
Below is how we would advise ordering, based on foot shape rather than on a blanket rule.
What to order
| Your foot | What to order | Why |
|---|---|---|
| Narrow | True to size | The narrower toe box suits you. No adjustment needed. |
| Average width | True to size | Comfortable from the first wear for most people in this group. |
| Wide | Half a size up | Gains room across the toe box without the shoe becoming too long. |
| Between sizes | Round up | A slightly roomy P-6000 wears better than a tight one. |
| High instep | True to size, lace loosely | The layered upper has limited give over the top of the foot. |
Why we do not say "size up" to everyone
It would be easier to tell everybody to add half a size and be done with it. It would also be wrong. The P-6000 is a low-profile shoe. Go a full size up and the extra length shows, the shoe looks long on the foot, and your heel will move inside it. That is a worse outcome than a slightly snug toe box.
Half a size is the right adjustment for a wide foot because it adds width where you need it, in the forefoot, without adding a visible amount of length. A full size up is not something we would recommend to anybody for this shoe.
Do they break in?
Partly. The mesh sections soften with wear and the shoe becomes more comfortable over the first week or two. The synthetic overlays do not stretch in any meaningful way. So if the shoe feels snug but wearable on day one, it will improve. If it feels genuinely tight across the toes on day one, it will not stretch its way out of that, and you should exchange it.
Comparing to other trainers you may own
Most people arrive at the P-6000 from a different Nike trainer or from a running brand. A few rough reference points:
- If you wear a standard Nike lifestyle trainer true to size, the P-6000 will feel slightly narrower in the same size.
- If you wear a modern cushioned running shoe, expect the P-6000 to feel flatter underfoot as well as narrower.
- If you are moving across from ASICS, our ASICS Gel trainer guide covers how those fit, and the Gel Kayano 14 guide is a useful comparison point for a wider shoe.
Our general sizing guide has the full conversion tables if you need to move between UK, EU and US sizing.
The two colourways and whether sizing differs
It does not. Both the P-6000 'Cool Grey' at £149.99 and the P-6000 'Anthracite Chrome' at £139.99 are built on the same last with the same upper construction. Order the same size in either. The only difference between them is colour and price.
Socks make more difference than you think
In a shoe with a narrow toe box, sock thickness matters. A thick cushioned sock will take up noticeable room in the forefoot. If you are ordering true to size and you tend to wear thicker socks, that is worth factoring in. A thinner sock is the easier fix than a bigger shoe.
What to wear them with once they fit
A tapered leg is the right call, because it lets the low silhouette show. The Grey Club Fleece tracksuit at £109.99 or the Black Club Fleece at the same price both gather at the ankle and sit well above the shoe. For warmer weather, the Challenger 7in Shorts at £44.99 keep the leg short and the trainer visible.
If you would rather see the whole picture first, the complete P-6000 buyer's guide covers the colourways, the styling and whether the price is fair.
If you order the wrong size
Orders placed before 2PM dispatch the same day, free UK delivery applies over £100, and both P-6000 colourways clear that threshold. Our refund policy covers returns and exchanges, and if you are unsure which size to commit to, get in touch before you order rather than after. Prices correct at time of writing.
Quick answers
Do Nike P-6000 fit true to size?
Yes for most people. The toe box is slightly narrow, so order half a size up if you have a wide foot.
Should I size up a full size?
No. A full size up makes a low-profile shoe look long and lets your heel slip. Half a size is the maximum adjustment we would suggest.
Do they stretch with wear?
The mesh softens over the first week or two. The synthetic overlays do not stretch. Snug will improve, genuinely tight will not.
Is the sizing the same in both colourways?
Yes. Cool Grey and Anthracite Chrome use the same construction, so order the same size in either.
I am between sizes. Which way do I go?
Round up. A slightly roomy P-6000 is more comfortable than a tight one, and a thinner sock closes the gap if needed.