Nike ReactX Rejuven8 Sizing Guide (2026): Do They Run Small or Big?

Looking for an accurate Nike ReactX Rejuven8 sizing guide before buying a pair?

The short answer is that the Nike ReactX Rejuven8 generally fits true to size, but the best size depends on whether you’re buying the clog or the slide.

The Rejuven8 Clog only comes in whole sizes and has a fairly snug, secure fit. Most people should stay true to size, while half-size wearers will usually be better off going up to the next whole size.

The Rejuven8 Slide also fits true to size, although the strap feels slightly snug when new and provides a more secure fit than many traditional recovery slides.

I have slightly wide feet, and I had enough width in both versions in my regular size 9. The clog was a little trickier because I had to get my foot through the opening, which felt tighter than I expected. Once it was on, though, I had plenty of room.

I’ve put together some sizing recommendations below for different foot shapes and for anyone who normally wears a half size.

For a wider comparison, you can also check my full Nike sizing guide where I explain how different Nike models really fit on foot.

Related: If you already know how other Nike models fit you, that context helps a lot here. If you’ve worn the Mind before, this Nike Mind sizing guide gives you a good baseline

One thing that surprised me about the Rejuven8 is it doesn’t fit like an Air Force 1, an Air Jordan, a Dunk, an Air Max, or even a traditional recovery slide.

The large ReactX foam platform wraps around your foot more than you’d expect, which means fit is influenced by foot shape almost as much as foot length.

That’s why I spent time testing multiple sizes and comparing both versions side by side.

In this Nike ReactX Rejuven8 sizing guide, I’ll break down exactly how the clog and slide fit, whether they run big or small, what half-size wearers should do, how they compare to Yeezy Slides, and which option works best for wide feet.

Before we start, use my Nike ReactX Rejuven8 sizing profile to compare your foot shape and fit preferences to mine so you can better judge which recommendations are most relevant to you…

Before we start, use my Rejuven8 sizing profile to compare your foot shape and fit preferences to mine so you can better judge which recommendations are most relevant to you…

Related: If you’re used to bulkier sneakers, this breakdown on whether Nike Air Max run small or big puts the Rejuven8 fit into perspective.

Nike ReactX Rejuven8 Sizing

Prefer video? Here’s everything you need to know about Rejuven8 sizing:

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Nike ReactX Rejuven8 Clog Sizing

The first thing that caught me off guard was the sizing setup itself…

Unlike most Nike footwear, the Rejuven8 Clog doesn’t come in half sizes. You’re limited to whole sizes only, which immediately makes sizing a little trickier if you’re normally between sizes.

I started with my usual size, a US 9, and honestly, the fit was better than I expected.

Width-wise, I had plenty of room. My foot sat comfortably inside the clog without any pressure along the sides, and nothing felt restrictive.

If anything, the Rejuven8 feels more accommodating across the width than many recent Nike sneakers.

Length was the only area where I hesitated.

My toes sat fairly close to the front of the clog. They weren’t touching the end, but they were close enough that I noticed it immediately.

I wouldn’t describe the fit as short, but I definitely wouldn’t have wanted it any shorter.

Naturally, I tried the next size up.

The problem is that the next size up wasn’t a 9.5. It was a full-size jump to a US 10.

As soon as I put the 10 on, the fit changed completely. There was more room in front of my toes, which I liked, but I could feel my heel moving around more when I walked.

I also noticed the opening around my ankle wasn’t holding my foot as closely as it did in the 9. I kept wanting to push my foot farther into the clog to get that snug feeling back.

It wasn’t sloppy, but it definitely felt less dialed in.

After wearing both sizes, I kept coming back to the US 9. The overall fit simply felt more secure and more natural on foot.

For anyone who normally wears a whole size, I’d stay true to size. That’s where I found the Rejuven8 performed best.

Related: Foam lovers should also check out Nike Foamposite sizing, especially if you’re comparing how stiff foams break in over time.

What If You’re Between Sizes?

Again, if you normally wear a half size, things get a little more complicated.

I usually wear a US 9 in older Nike models like Jordans, but many newer Nike releases fit slightly snugger, which means I often end up in a US 9.5.

Unfortunately, that option doesn’t exist with the Rejuven8.

If you’re a 7.5, 8.5, 9.5, or any other half size, I’d recommend going up to the next full size.

For example:

• 7.5: US 8
• 8.5: US 9
• 9.5: US 10

The reason comes down to length.

The Rejuven8 already has a fairly close fit near the front of the Clog, and the extra length from sizing up helps prevent your toes from feeling too close to the edge.

Yes, you’ll lose a little of that snug, locked-in feeling, but I’d rather have slightly more room than constantly feel the front of the shoe while walking.

Related: If you’re coming from lighter, sock-like models, the Nike Presto sizing helps explain why the Rejuven8 feels more structured.

Width and Foot Shape

One thing I really liked about the Rejuven8 was how accommodating it felt through the middle of the foot.

I have a slightly wide forefoot, and I never felt squeezed or restricted. The width actually surprised me because the clog looks narrower than it feels once it’s on foot.

If you have average-width feet, I think you’ll be perfectly comfortable staying true to size.

Wide-footers should have a good experience as well, although I’d consider sizing up if you’re already between sizes or simply prefer extra room around your toes.

Interestingly, getting into the clog felt slightly tighter than I expected.

The opening doesn’t allow your foot to slide in quite as effortlessly as some other recovery clogs. I noticed a little resistance while putting them on.

Once I got past the opening, I had plenty of space across my foot. I could walk around without my heel lifting or my foot shifting inside the clog, which is exactly why I liked the size 9 so much.

That secure feeling is a big part of why I don’t recommend sizing up unnecessarily.

Related: If Vapormax is your reference point, this Nike Vapormax sizing guide is useful for understanding how Nike handles true-to-size fits across very different cushioning systems.

How the Rejuven8 Is Supposed to Fit

I’ve seen some people recommend going up a full size, but after spending time with the Rejuven8, I don’t think that’s the right move for most people.

These aren’t designed to fit like oversized house slippers. They’re meant to feel secure.

The ReactX foam is incredibly soft, and I actually liked how the clog felt when I walked around in it. The 9 stayed on my foot nicely without feeling tight. I tried the 10 as well, but my heel moved around more than I liked.

The 10 would probably suit someone who wants a bit more room, especially with thick socks. Personally, I found it too loose.

For my feet, the 9 is the one I’d buy again.

That’s where I found the best balance between comfort, support, and security.

Related: If your next purchase is a pair of Nike sneakers rather than recovery footwear, I’d also compare how Air Force 1s fit compared to Nike Dunks before ordering.

Nike ReactX Rejuven8 Slide Sizing

I kept things simple with the slide version and went straight to my usual size, a US 9. The fit felt right immediately.

My toes had enough space at the front, and there was still some footbed showing behind my heel. I didn’t feel like I needed to move my foot forward or backward to get it sitting properly in the slide.

Unlike the clog, I never found myself wishing for a little extra room.

If you’re trying to decide what size to buy, my recommendation is straightforward: go true to size.

One thing I noticed right away was the strap…

The strap sits fairly low over the foot and feels snug when you first put the slides on. Personally, I liked that. One of my biggest complaints with some recovery slides is that they feel loose and sloppy while walking.

I didn’t get that loose feeling with the Rejuven8. The strap was quite close against the top of my foot, and I could walk normally without the slide shifting around much.

Another thing that stood out was the foam itself.

The ReactX foam has a slightly tacky, grippy texture that feels different from most slides I’ve worn. If you’re wearing socks, which I imagine most people will be, you’ll probably notice it immediately.

The foam tends to grab the sock as your foot slides in.

I had to straighten my socks a few times after putting the Rejuven8 on because the fabric had gathered around my toes. I’ve had the same problem with Yeezy Slides, although the Rejuven8 doesn’t grab quite as aggressively.

Related: If you’re used to the roomy feel of the Rejuven8, just know that the Nike Cortez sizing is much narrower and runs a bit smaller overall, so you may need to adjust accordingly.

Rejuven8 Slides vs Yeezy Slides Sizing

If you’ve worn Yeezy Slides before, the Rejuven8 Slides will probably feel familiar in some ways and different in others.

From a sizing perspective, both worked best for me at my true size.

The biggest difference comes from how the foam interacts with your foot.

My Yeezy Slides have a habit of pulling my socks forward when I put them on. Sometimes I have to take my foot back out and straighten the sock before trying again.

I get a bit of that with the Rejuven8, too, although I find the ReactX foam easier to slide my foot across. I don’t have to fight with my socks quite as much.

The strap is where things shift slightly.

I still think the Yeezy Slide has the better strap design. It covers more of the top of my foot, and I get less movement when walking in the Yeezy than I do in the Rejuven8.

The Rejuven8 slide still provides good coverage and security, but I noticed slightly more movement compared to the Yeezy.

Not enough to bother me, but enough to notice.

I wouldn’t change my size in the Rejuven8 Slide. The 9 gave me the room I needed, and the strap held my foot comfortably when I walked.

If you normally wear a whole size, I’d stick with it. I can walk around in my Rejuven8 without having to grip the footbed with my toes to keep the slide on.

How to Measure Your Feet for the Nike ReactX Rejuven8

I’ve found that sizing the Nike ReactX Rejuven8 is a little different from sizing a normal Nike sneaker.

With a running shoe or basketball shoe, you can often get away with focusing mainly on length. The Rejuven8 doesn’t work that way.

Because it’s built from a large piece of ReactX foam and has a very roomy, molded shape, your overall foot shape matters almost as much as your actual size.

A person with a narrow foot and a person with a wide foot can have completely different experiences in the exact same size.

That’s why I always recommend taking a few minutes to measure your feet properly before ordering.

Here’s the process I use.

1. Try the Rejuven8 On in Person (Best Option)

Nothing beats actually putting the Rejuven8 on your foot.

This is especially true because the Rejuven8 doesn’t fit like a Nike Dunk, Air Max, Air Force 1, or even a typical slide. The way the foam wraps around your foot plays a huge role in how the shoe feels.

When trying on a pair, don’t just slip them on for five seconds and look down.

• Walk around.
• Stand still.
• Take a few turns.
• Pay attention to how your foot sits inside the foam.

The things I pay attention to most are:

• Toe clearance
• Heel security
• Side-to-side movement
• Overall comfort

I want some space in front of my toes, but I also walk around for a bit to check whether my heel lifts or the clog feels loose. Standing still doesn’t tell me much about that.

In the clog, I’d pay particular attention to the heel. That’s where I noticed the biggest difference between my size 9 and 10. The 10 let my foot move around more than I wanted.

With the slide, I’d spend some time walking to see whether the strap is pressing too hard across the top of your foot. Mine felt snug in the 9, but I was comfortable with that amount of pressure.

One thing I noticed with both models is that comfort should feel immediate. The Rejuven8 isn’t a basketball shoe that needs ten hours of break-in time.

If something feels wrong right away, sizing may be the issue.

2. Get Professionally Measured

If you can’t try the Rejuven8 on in person, the next best option is getting measured by a shoe-fitting professional.

Most people know their shoe size, but far fewer know their actual foot shape.

A good fitting can tell you:

• Your true foot length
• Your true foot width
• Whether you have a high instep
• Whether you have a low-volume foot
• Which foot is larger

I’d especially want to know my width and instep measurements for the Rejuven8. My feet are somewhere between D and E, and I had no trouble with the clog in a size 9. I wouldn’t expect someone with an EE or EEE foot to necessarily get the same fit, though.

If you know your measurements, you can compare them with Nike’s chart and get a better idea of where to start, rather than relying entirely on the size you wear in other shoes.

3. Use a Brannock Device Correctly

If you have access to a Brannock device, it’s still one of the best tools available.

The key is using it properly.

Whenever I measure my feet, I always:

• Stand up fully
• Put my full body weight on both feet
• Place my heel firmly against the back cup
• Measure both feet separately
• Size according to the larger foot

Many people don’t realize their feet can change size throughout the day and that one foot is often slightly larger than the other.

4. Measure Your Feet at Home

If you don’t have access to a Brannock device, you can still get surprisingly accurate measurements at home.

Here’s the method I recommend:

You’ll need:

• A sheet of paper
• A pen or pencil
• A ruler or tape measure
• A wall

Then:

• Place the paper flat against the wall.
• Put on the socks you plan to wear with the Rejuven8.
• Stand on the paper with your heel touching the wall.
• Put your full weight onto your foot.
• Mark the tip of your longest toe.
• Use your ruler to check the distance between the wall and your toe mark.
• Do the same with your other foot.
• Use the longer measurement.

Once you have your measurement, compare it to Nike’s official size chart below:

Men's US	Women's US	UK	EU	Inches	CM
3.5	5	3	35.5	8 1/2	21.6
4	5.5	3.5	36	8 2/3	22
4.5	6	4	36.5	8 4/5	22.4
5	6.5	4.5	37.5	9	22.9
5.5	7	5	38	9 1/5	23.3
6	7.5	5.5	38.5	9 1/3	23.7
6.5	8	6	39	9 1/2	24.1
7	8.5	6	40	9 2/3	24.5
7.5	9	6.5	40.5	9 4/5	25
8	9.5	7	41	10	25.4
8.5	10	7.5	42	10 1/5	25.8
9	10.5	8	42.5	10 1/3	26.2
9.5	11	8.5	43	10 1/2	26.7
10	11.5	9	44	10 2/3	27.1
10.5	12	9.5	44.5	10 4/5	27.5
11	12.5	10	45	11	27.9
11.5	13	10.5	45.5	11 1/5	28.3
12	13.5	11	46	11 1/3	28.8
12.5	14	11.5	47	11 1/2	29.2
13	14.5	12	47.5	11 2/3	29.6
13.5	15	12.5	48	11 4/5	30
14	15.5	13	48.5	12	30.5
14.5	16	13.5	49	12 1/5	30.9
15	16.5	14	49.5	12 1/3	31.3
15.5	17	14.5	50	12 1/2	31.7
16	17.5	15	50.5	12 2/3	32.2
16.5	18	15.5	51	12 4/5	32.6
17	18.5	16	51.5	13	33
17.5	19	16.5	52	13 1/5	33.4
18	19.5	17	52.5	13 1/3	33.9
18.5	20	17.5	53	13 1/2	34.3
19	20.5	18	53.5	13 2/3	34.7
19.5	21	18.5	54	13 4/5	35.1
20	21.5	19	54.5	14	35.5
20.5	22	19.5	55	14 1/5	36
21	22.5	20	55.5	14 1/3	36.4
21.5	23	20.5	56	14 1/2	36.8
22	23.5	21	56.5	14 2/3	37.2

I’d use the measurement to find my Nike size first. Then I’d check whether that size gives me enough room across the foot and whether I like how it feels when I walk.

5. Don’t Ignore Foot Width

This is probably the most overlooked part of sizing. Many people focus entirely on length and never think about width.

With the Rejuven8, width can be just as important.

I found the clog quite roomy across the middle of my foot, even though the opening was a little tight when I first put it on. My forefoot measures between D and E, and the size 9 had enough width for me. If your feet are much wider, I’d try the next size as well, just to see whether you need that extra space.

On the slide, I’d be more concerned about how your instep fits under the strap. It sits fairly low, and I can imagine someone with a high instep feeling more pressure there. My feet aren’t particularly high-volume, so the snug strap didn’t bother me.

6. Measure Later in the Day

Your feet naturally swell as the day goes on.

I’d leave my measurements until later in the day, preferably after I’ve spent some time walking or standing. Feet can swell enough to make a difference, especially in something with a close-fitting strap like the Rejuven8 Slide.

You don’t need to wait until your feet are noticeably swollen. An afternoon or evening measurement is fine, and I’d use that rather than one taken straight after getting out of bed.

7. Think About Socks Before You Buy

I noticed the Rejuven8 foam grabbing my socks when I put the slides on. A couple of times, the fabric bunched up near my toes and I had to straighten it.

Thick socks can also make the strap feel tighter. I’d try the slides with whatever socks you normally wear, particularly if you like heavier cotton or wool pairs.

I wouldn’t automatically size up because of socks, though. My regular size 9 worked fine with mine.

If you wear the Rejuven8 barefoot most of the time, try them that way too. You might find you prefer a closer fit.

My Rule of Thumb

I’d start with my usual Nike size in both Rejuven8 models. That’s what I did, and the size 9 ended up being the better fit for me in the clog and slide.

With the clog, I’d check the heel before deciding to go bigger. I liked having a little extra toe room in the 10, but my foot moved around too much.

For the slide, I’d pay more attention to the strap. Mine felt snug at first, although it wasn’t uncomfortable when I walked.

And if you normally wear a half size, I’d try the next whole size up first, since Nike doesn’t give you a half-size option in the Rejuven8.

Nike ReactX Rejuven8 Sizing FAQ

Do Nike Rejuven8 fit true to size?

Yes. I’d go true to size in both the Nike ReactX Rejuven8 Clog and Slide.

I wear a US 9 in most Nike shoes, and that’s the size I ended up keeping in both. I did try a 10 in the clog because my toes were sitting fairly close to the front in the 9, but the extra room wasn’t worth the looser fit around my heel.

If you normally wear a half size, I’d go up to the next whole size. Nike doesn’t offer half sizes in either version.

Will Nike ReactX Rejuven8 stretch?

Don’t count on getting much extra room from stretching them.

The Rejuven8 is made from molded ReactX foam, not leather or fabric that you can gradually stretch out. The foam may feel a little more forgiving as you wear it, but I wouldn’t expect the length or width to change enough to fix a sizing problem.

I’ve also seen people suggest using heat to stretch foam footwear. I’d be careful with that. Too much heat can permanently distort the shape, and you could end up making the fit worse.

If your toes are already pressed against the front or the clog is painfully tight across your foot, I’d exchange it for another size.

Do Nike Rejuven8 break in?

A little, although there’s not much breaking in to do.

The ReactX foam is already very soft when you first put the Rejuven8 on. Both the clog and slide were comfortable straight out of the box, so I didn’t really have to break them in. I just got more used to the way the foam felt under my feet.

The slide strap was snug initially, but I got used to how it sat across my foot.

If they’re painfully tight when you first try them on, I wouldn’t wait a week hoping they’ll loosen up. The foam might give a little with wear, but there’s only so much room you’re going to get.

How do you shrink Nike ReactX Rejuven8?

I wouldn’t try to shrink them at home.

I’ve seen people use hairdryers, hot water, or leave their foam shoes in a hot car to make them shrink. The problem is you might end up shrinking one area more than another, or changing the shape in a way you didn’t intend.

And I definitely wouldn’t put the Rejuven8 in a clothes dryer.

If you bought a size that’s too big, see if you can exchange it before trying anything with heat. Even if you’ve already worn them and can’t return them, I wouldn’t risk making them worse just to take out a little extra room.

Should I size up for Nike Rejuven8?

Not if you normally wear a whole size and your usual Nike size fits you well.

I’d consider going up if:

• You normally wear a half size.
• Your feet are exceptionally wide.
• You prefer your clogs quite roomy.
  
• You regularly wear thick socks and need the extra space.
• For everyone else, staying true to size provides the best balance of comfort and security.

Just be careful about sizing up a full size in the clog. I tried both the US 9 and 10, and although I appreciated the extra toe room in the 10, it was too loose around my heel.

For the slide, I had no reason to go bigger than my usual 9.

Are Nike Rejuven8 good for wide feet?

Yes, I think they’re worth trying if you have wide feet.

My forefoot measures somewhere between a D and E width, and I had plenty of room in the size 9 clog. That actually surprised me because the clog looks a little narrower than it feels once you get your foot inside.

The slide was comfortable across my foot as well, although the strap felt snug over the top.

If you have very wide feet, especially EE or EEE, I can’t promise you’ll get the same fit I did. I’d try your regular size first if you can, and compare it with the next whole size if the sides feel tight.

I certainly wouldn’t size up automatically just because your feet are wide.

Final Thoughts

After trying the Nike ReactX Rejuven8 Clog in both a 9 and 10, I’d buy the 9 again. My toes were fairly close to the front, which initially made me question the size, but they weren’t touching. I also had plenty of width, and the clog stayed on my foot nicely when I walked.

The 10 gave me more toe room, but I didn’t like how much my heel moved around.

With the Rejuven8 Slide, I didn’t have that same sizing dilemma. I went straight for my usual US 9 and was happy with it. The strap felt a little snug at first, and the ReactX foam had a habit of grabbing my socks, but neither made me want to change sizes.

If you’re normally a whole size, I’d start with that size in both versions.

For half-size wearers, I’d lean toward the next whole size up. Just remember that a full-size jump in the clog can make quite a difference around the heel.

And if you have wide feet, don’t assume you’ll need to size up. I have a slightly wide forefoot myself, and the regular size gave me more than enough space.

I’m curious how other people are getting on with these, especially anyone who normally wears a half size.

Have you tried the Nike ReactX Rejuven8 Clog or Slide? Did you stick with your regular Nike size, or did you end up going bigger?

Let me know in the comments. I’d also be interested to hear from anyone who’s tried both versions and prefers one over the other.