What to Do If Your Sneakers Are Too Big or Too Small

The biggest challenge when shopping for second-hand sneakers online: will the size be right? Not every sneaker fits the same. Even within the same model, one release can fit differently from another. So, avoiding size issues completely isn’t possible. But how do you solve a sizing problem? One thing’s for sure-don’t start trimming your toenails with hedge clippers. In this blog, we’ll show you what you can do when your Nike Air Max pair doesn’t quite fit.

How do sneakers fit?

Many sneakers fit differently than other types of shoes. They often feel a bit tighter. Especially Nike is known to run small. That’s why you should always double-check your size. The model is the first indicator. For example, a Nike Air Max 1 fits slightly different than a Nike Air Max 90. The best advice is to try that specific model on in-store. Once you’ve done that, you’re on the right track.

Sneakers often fit differently. For example, the high-value Nike Air Max 1 Patta x Parra Cherrywood Burgundy runs more than half a size large.

Size variations within a single release

1. When were the sneakers produced?

The factory where your sneakers were made can affect the shape of the model-and that shape can influence the sizing. Every few years, Nike changes production facilities to different countries for cost or sustainability reasons. Sneakers from the same factory usually fit similarly. Check the size tag inside your shoe to see where they were made.

2. What materials were used?

The choice of materials matters too-especially the lining material inside the heel. A thick lining can make the sneaker feel smaller. A thin lining-or none at all (like the Nike Air Max 1 No Liner)-can make them fit larger. In general, leather sneakers fit bigger than mesh-based models. If you already own a pair made of similar materials, that’s a good size reference.

3. What sizing type is it-WMNS or MEN?

Sizing types are key too. Is the sneaker a WMNS (women’s), MEN, GS (grade school), or Y (youth) release? They can all fit slightly differently. For example, a WMNS pair runs 0.5 cm longer than the MEN version.

4. Have the sneakers already been worn in?

Last but not least-have the sneakers been worn before? The more a sneaker has been worn, the more the fit expands. The material softens over time. With Nike Air Max, you can check the “nipples” under the sole. If they’re still visible, the sneakers haven’t been worn much. If they’re worn down, the pair has seen some action. Always ask for a photo of the outsole when buying pre-owned.

Our insoles fix most sizing issues.

How to fix a size mismatch

Half a size too big?

Does your Nike Air Max 1 feel slightly too roomy? Sure, thick socks help-but that’s not ideal in summer. Tying your laces tighter might deform the shape. Our go-to tip is simple but effective: use a double insole. Place an extra insole from another pair underneath the original one. Don’t have a spare? Visit your local Wibra or Action store. Depending on thickness, a second insole can reduce up to a full size. Tightening your laces afterwards can help fine-tune the fit.

Half a size too small?

Sizing up is easier than sizing down. We don’t recommend buying sneakers that are a full size too small. But if it’s just a bit tight, there are options. No, trimming your toes isn’t one of them. Try lacing your sneakers more loosely. Or replace the original insoles with thinner ones. Wibra or Action sell ultra-thin replacements for under a euro. Still tight? Remove the insoles altogether-you’ll gain about half a size that way.

Good to know!

Asking how a sneaker fits is 100% normal in the sneaker world. Curious about how a specific Nike Air Max 1 fits? Post your question in one of the big Facebook groups like Nike Air Max 1 Enthusiasts.

Free tip: Avoid annoying others-post your question as a discussion, not as a sales post.

Did you know: Asics is notorious for confusing sizing. They even use different size charts for different models. We don’t get it either. Always check their official size charts.