Here’s a bold statement: You’ve probably been told that wearing the wrong running shoes could get you disqualified from a race. But here’s the truth—for 99% of runners, the idea of ‘illegal’ shoes is more hype than reality. And this is the part most people miss: those so-called ‘illegal’ shoes are likely the same ones you or your uncle wear on a casual jog. So, what’s the real story behind this controversy?
Let’s dive in. Over the past five years, running shoes have evolved dramatically—both in popularity and design. The running boom has made trainers a staple, but they’ve also grown taller, with thicker midsoles promising better performance. This is where the term ‘illegal’ shoe comes from, often thrown around by social media influencers (or ‘runfluencers’) who test these shoes against supposedly ‘legal’ alternatives. One creator even has an entire series dedicated to this, but there’s something misleading about their messaging—and it’s time to set the record straight.
The Rules, Simplified
World Athletics, the governing body for track and field, sets guidelines for competitive footwear. For road races, shoes can’t have a sole height exceeding 40mm and can only include one rigid structure, like a carbon plate. Most premium racing shoes follow these rules, but daily trainers? Not so much. In recent years, everyday running shoes have bulked up significantly, often surpassing these limits. Yet, these are the shoes most runners wear without issue.
Take Strava’s 2025 Year in Sport Report, for example. The top three running shoes logged by users were:
- Asics Novablast (41.5mm)
- Nike Pegasus (37mm)
- Hoka Clifton (42mm)
Notice anything? Only one of these falls within the ‘legal’ limit, yet they’re all widely used by everyday runners. And here’s the kicker: these shoes aren’t banned for recreational runners. They’re only a concern for elite athletes, who compete under stricter scrutiny—and even then, disqualifications are rare.
The Reality Check
I’ve run races like the New York Half Marathon and the Big Sur Marathon in shoes well above the 40mm limit, and I’m far from alone. Organizations like New York Road Runners (NYRR) apply World Athletics rules but handle violations on a case-by-case basis. Last year, NYRR didn’t disqualify a single runner for shoe-related issues. That said, professionals and triathletes face stricter enforcement, with events like Ironman banning specific models outright.
But here’s where it gets controversial: While ‘illegal’ shoes might not get you disqualified, they’re not without risks. High-stack shoes can alter your running gait and require an adjustment period. Dr. Mark Mendeszoon, a podiatrist, compares it to getting braces—it takes time to adapt. He recommends breaking them in gradually and focusing on flexibility, especially for your Achilles tendon.
So, should you worry about ‘illegal’ shoes? Unless you’re an elite athlete, probably not. But don’t let social media hype dictate your choices. Instead, focus on what works for your body and your goals. And if you’re still curious about training smarter, why not try our marathon plans for free? For a limited time, unlock 14 days of access to our complete training library on the Runner’s World UK app.
Controversial Question: Are shoe regulations in running events fair, or do they unnecessarily restrict innovation? Let us know your thoughts in the comments—we’d love to hear your take!
