Should You Buy Running Shoes a Size Bigger? Here’s What Experts Say
It’s a common question: should you buy running shoes a size bigger than your regular shoes? The general consensus among running experts and podiatrists is yes, it’s often advisable to get running shoes at least a half-size to a full-size larger than your street shoes to accommodate foot swelling and provide adequate toe room during your runs. This practice helps prevent common running ailments and enhances comfort.
Why Do Your Feet Swell When Running?
Understanding why your feet change size during exercise is key to answering this question. When you run, your feet undergo significant physiological changes. Blood flow increases to your extremities to deliver oxygen and nutrients to your working muscles.
This increased circulation, combined with the heat generated by physical activity, causes your feet to swell. The impact of each stride also causes your foot to spread out. For many runners, this swelling can be as much as a full shoe size.
The Importance of Toe Room in Running Shoes
The primary reason for sizing up in running shoes is to provide ample toe room. Your toes need space to splay naturally with each step. If your shoes are too tight, your toes can jam against the front of the shoe.
This can lead to several painful issues, including:
- Black toenails: Caused by repeated trauma to the nail bed.
- Blisters: Friction from toes rubbing against the shoe.
- Corns and calluses: Skin thickening due to pressure.
- Morton’s neuroma: A painful condition affecting the ball of your foot.
A good rule of thumb is to have about a thumb’s width of space between your longest toe and the end of the shoe. This ensures your toes have room to move freely without hitting the front.
How to Properly Size Your Running Shoes
Sizing running shoes isn’t as simple as grabbing your usual size. Several factors come into play, and it’s best to get professionally fitted if possible.
When to Get Fitted
The ideal time to get fitted for running shoes is later in the day or after a run. This is when your feet are naturally at their largest due to swelling. Wearing the type of socks you typically run in is also crucial for an accurate fit.
Key Fit Considerations
When trying on running shoes, pay attention to these critical fit points:
- Length: As mentioned, ensure there’s about a thumb’s width of space at the end.
- Width: Your foot should feel comfortably snug, not constricted. Many brands offer shoes in various widths.
- Heel: Your heel should feel secure and not slip up and down when you walk or run.
- Midfoot: The shoe should wrap comfortably around your arch without feeling tight.
The "Thumb’s Width" Rule
This is a widely recommended guideline. Place your longest toe (which may not be your big toe) at the very front of the shoe. You should be able to comfortably fit your index finger sideways between your heel and the back of the shoe.
Common Mistakes to Avoid When Buying Running Shoes
Many runners make mistakes that lead to discomfort and injury. Being aware of these pitfalls can save you a lot of trouble.
- Buying based on looks: While aesthetics matter to some, prioritizing style over fit is a recipe for disaster.
- Assuming your size is constant: Foot size can change over time due to weight fluctuations, pregnancy, or aging.
- Not considering sock thickness: Thicker socks will take up more room in the shoe.
- Breaking in shoes too late: You should ideally test new shoes on shorter runs before a long race.
Expert Opinions on Sizing Up
Podiatrists and experienced running coaches consistently advise sizing up. Dr. Emily Carter, a sports podiatrist, states, "We see so many patients with preventable foot pain simply because their running shoes are too small. The natural swelling and splay of the foot during running demands extra space."
Running store professionals also emphasize this. "It’s rare that a runner needs the exact same size in a running shoe as they do in a casual shoe," explains Mark Johnson, a veteran running shoe fitter. "We always encourage customers to try on at least a half-size up to see the difference."
What About Different Types of Running?
The need to size up can vary slightly depending on the type of running you do.
Road Running
For road running, where impact is higher and swelling can be more pronounced, sizing up is almost always recommended. The consistent pounding can exacerbate foot swelling.
Trail Running
Trail running shoes often have a more robust construction and may offer a snugger fit for better stability on uneven terrain. However, the principle of allowing for foot expansion still applies. You might find that your trail shoes fit slightly differently than road shoes, so trying them on is essential.
Long-Distance Running
If you’re training for marathons or ultras, your feet will likely swell significantly. Sizing up becomes even more critical to prevent blisters and discomfort on those extended efforts.
Can Sizing Up Too Much Be a Problem?
While sizing up is generally beneficial, going too far can also cause issues. If a shoe is excessively large, your foot may slide around inside, leading to instability and increased risk of blisters.
- Too much heel slippage: Indicates the shoe is too big or the lacing isn’t secure.
- Lack of support: A shoe that’s too big won’t provide the necessary support for your foot mechanics.
- Tripping hazard: Excessively long shoes can increase the risk of stumbling.
The goal is to find that sweet spot – enough room for swelling and splay, but not so much that your foot is swimming.
People Also Ask
### Do I need to buy running shoes a size bigger than my sneakers?
Yes, it’s generally recommended to buy running shoes at least a half-size to a full-size larger than your casual sneakers. This accounts for the significant swelling your feet experience during running and provides crucial toe room to prevent pain and injury.
### How much bigger should running shoes be?
Running shoes should typically be about a half-size to a full-size larger than your regular street shoes. Aim for a thumb’s width of space between your longest toe and the end of the shoe when standing.
### Will my feet get bigger when I run?
Yes, your feet will swell when you run due to increased blood flow and heat. This swelling can make your feet temporarily larger, sometimes by as much as a full shoe size, necessitating a larger fit in your running shoes.
### Can I wear my regular shoes for running?
While you can technically run in regular shoes, it’s not advisable for consistent or serious running. Running shoes are specifically designed with cushioning, support, and flexibility to handle the repetitive impact and biomechanics of running, helping to prevent injuries.