Tuning frictional behavior on the fly has been a long-standing engineering dream. This new insight into how surface geometry governs slip pulses paves the way for tunable frictional metamaterials that can transition from low-friction to high-grip states on demand.
The system, tested in prototype form by NPR at the company's headquarters, consists of fairly standard-looking sneakers with a carbon fiber plate running through the soles. These sneakers are attached at the back to close-fitting, 3D-printed titanium leg shells that cinch to the calves. The battery-powered contraptions, containing complex motors, sensors and circuitry, weigh a couple of pounds and look like something out of Terminator or RoboCop.
The results showed that the squeaking sound is produced by wave-like patterns across the rubber surface, contacting and then releasing from the glass, allowing the sliding between the surfaces. The waves move across the interface between the two materials at a speed of nearly 300 kilometers per hour.
Rather than waiting until you arrive in a ski village or going out of your way to drive into the mountains, Boot Solutions is introducing a process in which you simply scan your feet and they do all the fitting remotely. Overall it seems pretty simple. You use the Boot Solutions app on on your phone to take a medical grade 3D scan of both feet and the company offers you plans from there.
For runners, the hips can be one of the most confounding and frustrating parts of the physiological puzzle for efficient movement. Every runner knows how crucial hip strength is - and how mobile hips are essential for both fast and pain-free running. Yet healthy, happy hips remain elusive. For many of us, our hips stay stiff no matter how much we massage and stretch them.
Squeaking occurs across various contexts including shoes, bike brakes, rubber tires, and biomedical implants when soft and hard surfaces contact each other. Researchers used high-speed photography to study a rubber block sliding across hard acrylic to identify the source of these sounds. The investigation revealed that pulses similar to earthquake dynamics drive the squeaking phenomenon.
We were not expecting to find so much richness and depth from a physics point of view underneath the sole of a shoe, says Adel Djellouli, a scientist at Harvard University and co-lead of the study. In a new study, scientists explore the physics that give rise to the familiar squeak of basketball shoes sliding on a hard surface.
Super shoes and ultralight gear make a difference, but with new advancements in artificial intelligence (AI) that can look at our running form and compare it to the ideal, analyze our nutrition intake from a simple photo and help us plan our diets, and offer guidance on training and recovery, the interwovenness of technology and running is only set to increase.
The midsole of the Nimbus 28 is slightly softer than the 27 but it's not very noticeable. The 28 midsole is also more sculpted and more streamlined which is how they managed to reduce the weight. The 28 is 7% lighter than the 27.
In addition to being comfortable to wear for long periods of time, I make sure my sneakers are supportive, don't give me blisters, and have a long-lasting quality. Skechers Hotshot Cool Transition Suede Sneakers from QVC met all of these requirements with flying colors after I tested them out recently, and they have become my go-to pair of walking shoes.
The On Cloudlfow 5 is a versatile daily trainer that is heavily focused on fast training runs, intervals, and speed workouts. They are part of On's lineup of performance-oriented footwear;they are not just an "everyday" sneaker. It is packed with numerous great technologies from On. Some of the new features include a top layer of Helion HF supercritical foam, a nylon-blended Speedboard, a rockered midsole geometry, and an upper made from engineered mesh.
The Brooks Adrenaline GTS reaches a major milestone in 2025 with the release of its 25th edition. Outside of the ASICS Kayano, it's hard to think of another stability trainer that has remained in production for this long. That longevity speaks to a shoe built on a strong foundation, one that has continued to evolve over the years while maintaining its place as one of the best-selling stability shoes on the market.
Puma PUMA MagMax Nitro 2 Verdict The PUMA MagMax 2 is a good max-stack daily trainer with deep cushioning and a moderately bouncy ride. Version 2 gets rid of the annoying poking arch and has a tweaked midsole that's more energetic. I was impressed with the updates made to the MagMax 2; however, there are similarly priced competitors with even more energetic rides. Daily training
Specifically, the company is focusing on the production of its newest, weirdest shoe-a giant soled laceless running shoe with a single-piece toe box made of "hyper-foam" plastics sprayed on by robot arms. The plastics are 40 percent biofoam, and the shoe is made of just eight pieces; On says its minimalist approach saves on the shoe's carbon footprint.
The Hyperion Elite 5 has a midsole made entirely of DNA Gold, a PEBA foam. It's the foam with the highest level of energy return of all the Brooks midsole foams. The Hyperion Max 3 has a dual-density midsole with a top layer of DNA Gold and a bottom layer of DNA Flash, an EVA foam. The firmer DNA Flash provides a stable, durable base. Both shoes have plates in their midsoles but the Hyperion Elite 5 has a stiff carbon plate while the Hyperion Max 3 has a flexible nylon plate.
I had to blink the first time I landed on the product page for the Nike ACG Ultrafly Trail. I'd seen lots of promotional assets ahead of the release (see here and here), where the trainer is caked with mud. But in the end, it's hi-vis orange - and like any other brand-new shoe, being sold without a stain or scratch.