Yeezys run small is really the 350 runs small, and the 350 is just the pair most people own. The 500 and the 700 fit like ordinary sneakers, and the Slide does not follow the sneaker answer at all. Pick the model you are actually buying.
There is no single Yeezy answer, and that is the answer
Ask whether Yeezys run small and you will be told yes, confidently, by almost everyone. The claim is true and it is also the wrong shape, because it describes one shoe. The 350 runs small. The 350 is also the pair most people own, so its behavior got promoted into a fact about the brand, and the people repeating it are not lying so much as generalizing from a sample of one.
Line the models up and they are barely the same kind of product. The 350 and the 380 are knit, and a knit upper wraps your foot rather than sitting around it, which reads as snug whatever the last measures. The 500 and both 700s are chunky structured sneakers built on an ordinary runner's last, and they fit like ordinary sneakers. The Slide is a sandal. Taking the 350's half size up and applying it to a 700 leaves you in a shoe that is genuinely too long, which nothing fixes afterwards.
The formula
350 V2 and 380 = your usual size + 0.5
500, 700 and 700 V2 = your usual size
Slide = a full size up, whole sizes only
UK = US men's − 0.5 | EU = US men's + 33
Width is the second axis and it does not point the same way twice, for reasons covered below. Conversions match our shoe size converter, so the two pages cannot disagree.
Worked example
Say you wear a US men's 10. In a 350 V2 you order a 10.5, which reads UK 10 and EU 43.5. In a 700, the same feet order a plain 10, UK 9.5 and EU 43. That is a half size of difference inside one brand, and the person who bought both with the same rule got one of them wrong. Now add wide feet: the 350 stays at 10.5, because sizing up again would buy length you do not need, while the 500 moves from 10 to 10.5, because its toe box is rigid and the room has to be ordered.
Width moves you in opposite directions
Most brand fit pages treat width as a single adjustment: wide feet go up. Here that would be wrong three different ways, because what a wide foot needs depends on what the upper is made of.
On a knit 350 you have already gone half a size up for the wrap, and going further buys length rather than width. Knit does give across the forefoot, which genuinely helps, but it gives from a narrow starting point, and if a 350 has felt wrong on you before then size was probably not the reason. On the 500 the opposite applies: the toe box is structured leather and suede, it will never stretch or relax, so the room has to exist the moment you order or it never arrives. On the 700 you need nothing at all, because it is the roomiest shoe in the line already.
The Slide is its own argument
Slides are the one product here where the maker and the people wearing it disagree outright. The overwhelming consensus among wearers is that they run small, with the strap sitting tight across the bridge of the foot at true size, and a full size up is the usual fix. Adidas' own guidance points the other way and suggests sizing down.
Two further facts settle more of this than either camp does. Slides are sold in whole sizes only, so there is no half-size hedge in either direction and every recommendation is a bigger jump than it looks. And the Slide was retooled, with pairs from the newer mold running noticeably larger than the old ones, which means some of the disagreement is people comparing different products. If yours is recent, expect it closer to true to size than the folklore says.
How this compares to our other brand pages
Four brand pages, four different conclusions, and the differences are about materials rather than about brands being inconsistent. Chuck Taylors run a genuine half size large, so there the size down is a correction. Vans are true to size new and looser later, because canvas stretches, which makes the honest answer depend on when you ask. Air Jordans are true to size in length and the real variable is width, with the patent-uppered Jordan 11 never giving at all.
The common thread is that a size number describes length, and most fit complaints are about width or about how an upper behaves over time. Knit wraps. Canvas stretches. Patent leather does nothing. Once you know which of those you are buying, the size usually follows.
Frequently asked questions
Do Yeezys run true to size?
Some do and some do not, which is why the question keeps getting answered badly. The knit models, the 350 V2 and the 380, run snug and half a size up is the usual fix. The 500 and both 700s are true to size in length. The Slide is a separate argument entirely. Answering for the brand rather than the model is how people end up a size out.
Should I size up in Yeezy 350s?
Half a size up, yes. The Primeknit upper wraps your foot rather than sitting around it, so the shoe reads snug even though the last is not short. That is a fit sensation rather than a length problem, and half a size is the amount that fixes it without leaving you in a shoe that slips.
Do Yeezy 700s run small?
No, and this is the most common Yeezy sizing mistake. The 700 is the roomiest shoe in the line, a chunky structured runner built on an ordinary last. Taking the half size up that works on a 350 and applying it here gives you a shoe that is genuinely too long, and there is no fixing that afterwards.
Do Yeezy Slides run big or small?
Most wearers say small and go a full size up, because at their true size the strap sits tight across the bridge of the foot. This is one of the rare cases where the maker disagrees with its customers: adidas' own guidance points toward sizing down. Two further facts matter. Slides come in whole sizes only, so there is no half-size hedge, and the Slide was retooled, with newer pairs running noticeably larger than older ones.
Do Yeezys work for wide feet?
It depends which one, and the answer moves in opposite directions. On a knit 350 there is no extra size to give you, because sizing up buys length and your problem is width; the knit does stretch, but from a narrow start. On a 500 the toe box is structured and will never relax, so a wide foot genuinely does need the half size. On a 700 you need nothing, since the room is already there.
Why is the 500 tight if it is true to size?
Because length and width are different measurements and only one of them is what the size number describes. The 500 measures true in length while being narrow and stiff across the front, built from structured leather and suede rather than knit. A knit upper relaxes around a wide foot. A structured one does not, so on the 500 the room has to be bought when you order.
How do Yeezy sizes convert to UK and EU?
UK is half a size below US men's and EU is US men's plus 33, so a US men's 10 is a UK 9.5 and an EU 43, about 27.1 cm of foot. Those are the same conversions our shoe size converter uses, so the two pages cannot give you different answers.
Are Yeezys unisex?
The sneakers are sold on the men's scale and listed with both numbers, so a women's size is the men's size plus about 1.5. That matters more here than on most brands, because the Slide behaves differently on the two scales: men overwhelmingly report it running small while women more often find it true to size, and the likeliest reason is simply that converting from a women's size already lands you in a roomier sandal.