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Running has been a competitive sport for over a century, with the Boston Marathon—first held in 1897—standing as clear proof. But the phrase “energy return” has only gained attention in the last decade or so. Why is that? For decades, running shoes relied on EVA foam, which is light but not very springy. But once advanced materials like TPU, TPEE, PEBA, and A-TPU entered the scene, everything changed. Suddenly, brands started chasing the goal of 100% energy return. This[…]

Disclaimer: For ease of understanding in the context of reviewing running shoes, we use the term "softness" instead of "hardness." In the RunRepeat lab, we ensure precise midsole softness measurements by first cutting the shoe in half. This approach enables us to apply the durometer directly onto the actual foam for getting accurate results. It's a costly process, especially as we purchase all our shoes without accepting any from brands, and that’s probably why every run[…]

The heel counter in running shoes is a semi-rigid, U-shaped piece, that snugly wraps around the heel. It stretches over the shoe's upper heel portion and typically includes two sidewall parts that extend forward beneath the medial and lateral malleoli. This component is crucial for stability because it locks down the rearfoot, and its design greatly improves the fit and comfort around the heel area, effectively preventing heel slippage even during uphill running. It also[…]

While the toebox might not be the most prominently featured aspect in the marketing of running shoes, it plays an essential role in determining the quality and comfort of your run. It's not just a matter of fit; the toebox can influence everything from the mechanics of your stride to the level of support and space your feet receive. In this guide, we will explore the subtle yet important details that establish the toebox as a crucial component of running shoes. You'll ga[…]

Breathability in running shoes it's a crucial feature that's often overlooked by both consumers and critics alike. At RunRepeat, we're convinced of the essential role of airflow—a view that is supported by this study as well. To provide you with the most accurate and comprehensive insights, we employ cutting-edge smoke tests for each pair of shoes that undergoes our lab tests. Additionally, we utilise a microscope and a powerful light to delve deeper into the structural[…]

Only a short while ago, running shoes had a simple design: mostly flat with a modest upward tilt at the toe. But then brands like MBT and Hoka, among others, revolutionised the scene with their unique maximalist rocker style. More and more shoe brands today are integrating the rocker design into their lineup. It’s evident that this isn't just a fashion trend—it's a design that genuinely works. Step into this guide with us as we dissect everything about rockered shoes, en[…]

Ever laced up a fresh pair of running shoes, taken your first strides, and felt that the promised heel-to-toe drop simply doesn't match reality? If you've ever found yourself in this situation, you're not alone. It's a scenario all too familiar for many runners and one that stems from a surprising fact: brands fail to accurately state the heel-to-toe drop of their running shoes. Sometimes, these discrepancies aren't minor—they can be as substantial as a whopping 168% dev[…]

Men's and women's shoes have different features. Though each aims to offer foot comfort and protection during runs, significant design and fit adaptations have been made over time to cater to the anatomical differences across genders. By understanding these variations, ranging from sizing nuances to alterations in width and shape, you can make informed decisions when choosing running shoes built to your unique requirements. Decision chart: How to make the right choice Ok[…]

The outsole, a vital part of any running shoe, forms your crucial link with the ground during your run. Not only does it help prevent slips and falls, but it also ensures a firm grip, offering the traction necessary for a safe and effective run. However, the importance of the outsole is often overshadowed by the advancements in midsole foams and cushioning technology. And it should not be overlooked, as the outsole plays a critical role in the success of a running shoe.[…]

Running shoe companies aren't as transparent as we'd love, making it difficult for both casual and advanced runners to gather detailed information about specific running shoe foams.  Recognising this challenge, we've done an extensive guide for you, presenting our findings and knowledge about running shoe midsoles in a clear and comprehensive manner. What makes foam so important for running shoes? The midsole in a running shoe is undeniably the most crucial component, as[…]