What Is Heel Slip In Shoes and Why Is It Bad? Plus, How to Fix It (2024)

If you’ve worn a really poor-fitting pair of training shoes, then you may have some experience or exposure to heel slip. Heel slip is something that can be incredibly frustrating for lifters and athletes who are trying to get the most out of their shoes.

On my YouTube channel, I’m constantly answering training shoe sizing questions and working to help others navigate issues like heel slip. Shoe sizing can be really tough to navigate at times due to how individual all of our feet are and how many different shoe lasts exist.

In this article, I’m going to discuss heel slip and how to navigate around it. If you’re noticing that your heels are popping out of your training shoes, then read on and we’ll discuss what to do about it.

How to Prevent Heel Slip

If you’re experiencing heel slip in your training shoes, then there are a couple of things to do and try in order to navigate around this issue without fully ditching hopes of wearing the model in question.

1. Try Using a Lace-Lock (Heel Lock) Technique

2. Try Sizing Down a Half Size

The first potential fix for heel slip is to try going down a half size. This is the easiest potential fix and will be best for those that are experiencing heel slip due to excessive room in the toe box.

If you find that you have about an inch of space at the end of your toe box, then you should try sizing down a half size to see if this limits the heel slip issues you’re having. Ideally, you want anywhere from .2-.3″-.6-.7″ of clearance in the toe box.

Now, let’s say you’re having heel slip issues and the shoe fits true in regard to length, should you size down? No, because the shoe already fits well in regard to length, and sizing down could make it too tight.

More than likely, for this scenario you may just need to explore other models because the shoe’s last in question is not aligning with your foot anatomy.

What Is Heel Slip?

Heel slip is the act of the heel popping out of the boot of the shoe unintentionally during various movements. Heel slip severity in your shoes can vary and the act of heel slip can present itself at different times based on the activity you’re performing, how your foot is built, and how the shoe you’re wearing is built.

For example, if your shoes fit very poorly and you’re experiencing a lot of heel slip, then you can experience heel slip when doing low-intensity exercises like walking.

Conversely, if your shoes fit okaybut there are still discrepancies between your shoe’s sizing and your foot anatomy, then you may only notice heel slip when doing things like plyometrics, lifting, and other high-intensity exercises.

The latter of the two examples discussed above is the most common in which heel slip will present itself during one’s time wearing a pair of shoes.

With high-velocity and high-intensity exercise, we’ll be placing a greater demand on the ankles and their function more specifically when they’re moving through plantarflexion and dorsiflexion.

Plantarflexion is when we flex the ankle downward with the balls of the feet driving into the ground, and dorsiflexion is when we flex the ankle with the toe pointing towards the feeling.

When we move through rapid rates of plantarflexion and dorsiflexion, we can run into problems with the heel slipping out of our shoe’s boot if the shoes we’re wearing don’t fit properly.

This can be even more prevalent when we consider multi-directional activity, too, AKA moving forward, laterally, and backward with our weight as a whole shifting into these directions.

Why Is Heel Slip Bad?

There are a few reasons why heel slip with your shoes can be detrimental for both working out and daily wear. The severity of heel slip and how much it will impact you will vary based on what you’re doing.

1. It Makes Your Shoes Feel Less Secure

First, it can hinder your workout performance by making your shoes feel less secure. For example, let’s say you’re doing a box jump and you have heel slip during the take-off phase.

This can throw off your confidence with your jump and cause issues during the landing phase of your jump.

2. It Can Cause Blisters Due to Friction and Rubbing

Second, heel slip can cause blister issues on the ankle and Achilles tendon. When we have shoes that are constantly sliding up and down the Achilles and ankle, then we can run into blister issues due to the increased friction.

Blisters can not only feel uncomfortable but also ruin our socks and stain the boots of our shoes.

3. Heel Slip Can Throw Off Your Movement

Third and lastly, heel slip can change our movement mechanics. If we notice that our shoe is sliding around when training, then we’ll start to subconsciously move in a means that allows us to feel more secure in our shoes.

Small mechanical changes can add up over time and cause decreased performance, which is the last thing we want when training consistently.

When Does Heel Slip Happen?

We touched on this point briefly above, but to provide more context and to help you understand in greater depth why heel slip can happen I wanted to dive into three specific areas that can play a role in heel slip.

1. Poor Fitting Shoes (Misaligned Shoe Lasts and Foot Anatomy)

The first and most common reason heel slip can occur is that your shoes don’t fit your foot properly. This could mean that your shoes are a bit too large in regard to length so the additional toe box room causes your foot to slide forward and your heel to pop out.

In addition, this could also mean that the last (mold) of the shoe you’re using doesn’t align with your foot’s anatomy. When building shoes, companies have hundreds of shoe lasts to select from, and they try to choose a last that will capture the widest market share. A shoe last is essentially the foot mold in which the shoe is based and sized around.

This is why some shoes, no matter how you size up, won’t align with your feet. A good example here would be an athlete or lifter with a very narrow foot trying to fit into a Reebok Nano X3 which has a slightly wider last and construction.

No matter how this athlete sizes their Nano X, they may never fit this shoe completely and that’s because the last of the shoe doesn’t align with their foot anatomy. This is normal and adds to the importance of exploring different models to find shoes that actually fit your foot’s anatomy well.

If you’re someone with a wider or more narrow foot, then you can be a bit more prone to experiencing heel slip in certain shoes. Generally, athletes and lifters with more neutral feet can get away with wearing a wider range of models without issues.

2. Low-Profile Boots

Another reason you may run into heel slip with your training shoe is their profile and boot construction. At times, a shoe’s boot construction can be the sole reason for heel slip with some lifters and athletes despite the shoe seemingly fitting well.

Some good cross-training shoe examples here are the Nike Metcon 6 and Nike Metcon 7, which havelow-profile constructions.

Let’s say you’re someone that has a thicker heel bone and there’s less physical boot construction making contact with your heel in something like a Nike Metcon 8 and Metcon 7.

In this case, you may experience heel slip despite technically having your sizing right because there’s less material to help keep the boot secure on the heel.

The big takeaway here is that sometimes heel slip is inevitable in shoes you’re wearing and that can be due to how a shoe is built and how it interacts with your individual foot and ankle anatomy.

Not every shoe is going to work with our feet and that’s normal, and we’re not weird for having some issues that just don’t agree with us.

Wrapping Up

Heel slip can be incredibly frustrating, especially in the context of training shoes. Heel slip can not only hinder performance in the gym but can also cause blisters which is less than ideal for long-term performance and comfort.

If you have any questions about heel slip and what to do to navigate around it, feel free to drop comments below or reach out to me personally via Instagram (@jake_boly).