Olympic Champions Are Wearing This $200 Cooling Headband. Does It Actually Boost Performance?

A new study tests the performance claims of Omius’ unique looking headband worn by Olympic legends Sifan Hassan and Eliud Kipchoge.

As the best men’s marathoners in the world prepared to race in Paris last month, Jake Leschly was waiting at the 3K mark, peeping over the shoulder of the spectator next to him, who was streaming the race broadcast on his phone. Leschly is the CEO of a small three-person company called Omius, which makes a bulky, futuristic-looking headband that purports to keep you cool—and he was about to get a pleasant surprise: “They introduce Kipchoge,” Leschly recalls, “and I’m like, ‘Son of a bitch, he’s wearing it!’”

Omius’s headband first showed up in the triathlon world back in 2019. The fledgling company took a hiatus during the pandemic, but resumed sales in 2022. Triathletes have been enthusiastic: according to Leschly, 43 of the 53 pros at last year’s Women’s Ironman World Championship in Kona wore it, along with a third of the 2,000 age-group competitors.

But the headband’s conspicuous presence at this summer’s Olympic marathons—along with Kipchoge, other notables wearing it included Sifan Hassan and Hellen Obiri, the gold and bronze medalists in the women’s race, and Bashir Abdi, the silver medalist in the men’s race—brought it to a new audience. In the

The one simple trick that Omius relies on is to increase the surface area available for evaporation. The headband contains 20 cooling units, each of which consists of nine mini-towers of porous and heat-conducting graphite. Overall, this increases the surface area of the relevant patch of your forehead by a factor of five. The cooling units can be swapped in and out; Omius also makes visors and caps, and is developing other garments.

As long as you keep the headband damp and have airflow passing across it, water will evaporate from this large surface area, drawing heat away from your forehead and creating a cooling effect. Sweat can help moisten the cooling units, but in most situations you’ll need to periodically splash or spray them with water. You’ll generate enough airflow simply by running outdoors, but to use the headband indoors on a treadmill or stationary bike, you’ll need a fan. Leschly advises against cycling outdoors with it, because the cooling units don’t have appropriate impact properties.

You might think that the goal of sucking all this heat from your forehead is to cool your whole body down. That’s been the claim for some previous cooling devices, like palm-coolers that purported to lower your core temperature. But Omius isn’t going down that road. “It obviously does not change your core temperature,” Leschly says. “Nothing changes your core temperature.” Instead, he says, it’s a local effect that makes you feel cooler, enabling you to go faster. That’s not a crazy claim: one study, for example, found that applying a tiny amount of heat through a heat pad caused cyclists to slow down even though their core temperature didn’t change. But it makes Omius’s claims much harder to test.

Desroches’s study involved ten volunteers who completed a running test twice: once with the real headband and once with the sham headband. The test involved 70 minutes of running in a heat chamber set to 95 degrees Fahrenheit with 56 percent humidity at a predetermined moderate pace, followed by an all-out 5K time trial. The researchers measured all sorts of physiological data, including core temperature with a rectal thermometer, skin temperature with four different probes, and forehead temperature

It’s probably worth mentioning that the basic headband with cooling pieces currently costs $204. That’s considerably more than other cooling options like, say, pouring water on your head. As it happens, there’s another new study, just published in the International Journal of Sports Physiology and Performance by a team led by Samuel Chalmers of the University of South Australia, that explores the benefits of pouring water on yourself during hot runs.

While the details differ, the two studies are remarkably similar. In this case, 13 runners did a 10K time trial followed an hour later by a 60-minute moderate run, in a room set at 87 degrees Fahrenheit and 47 percent humidity. They completed this protocol twice; in one of the sessions, they poured two cups of water over their head, face, and arms every 2.5K or ten minutes. As with the headband, water dousing made them feel cooler and lowered their skin temperature, but didn’t change their core temperature. There is one key difference compared to the headband, though: they ran 1.0 percent faster in the water dousing time trial, which was a statistically significant benefit.

Because of the differences in protocol—the lack of a placebo trial

posted Saturday September 28th
by Outside online