famously experimented with all sorts of fabrics and uniform designs<\/a>, from one-legged tights to a hooded speedskating suit that she wore at the 1987 World Championships. Speedskaters, like cyclists, had figured out by then that aerodynamics make a big difference at high speeds. But at lower speeds, the benefits are less clear, even for sprinters. For longer distance runners and recreational athletes, the prevailing advice has long been to simply stick with whatever feels comfortable.<\/p>\nThat started to change a decade ago, when Nike launched its multimillion-dollar Breaking2 project in pursuit of a sub-two-hour marathon. Among the innovations they rolled out for Kenyan superstar Eliud Kipchoge and his teammates was a wholesale rethink of their uniforms: arm sleeves, a tighter-than-usual sleeveless tank top, half-tights with aerodynamic patterning and targeted bands of compression for muscle support, and even textured aerodynamic tape on the inner calves to reduce drag as the ankles whip back and forth.<\/p>\n
The centerpiece of Nike\u2019s Breaking2 initiative was the first carbon-plated super shoe, which they boasted would improve running economy by four percent, meaning that it takes four percent less energy to run at a given pace. But they didn\u2019t make any similar claims about the clothing. When I tried to pin down one of the company\u2019s apparel designers in 2017 about the new uniform\u2019s benefits, he downplayed expectations. The potential benefit would be measured in seconds over the course of a marathon, he said. \u201cBut even if it was just one second, that would be significant,\u201d he added. \u201cWe would feel really bad if we didn\u2019t try everything and they ran 2:00:01.\u201d<\/p>\n
Others were feeling more ambitious, though. Around the same time, research groups from around the world began publishing data on \u201cunpowered exoskeletons\u201d\u2014basically mechanized pants that make it easier to walk or run. Initial designs looked more like Robocop suits, but over the years they\u2019ve gotten simpler and less obtrusive. A Korean design published in 2021 showed a 2.5-percent improvement in running economy with what amounts to a pair of half-tights with an elasticized band running up the quads and connected to suspenders. Super shoes had already transformed running; now it looked to be only a matter of time before super pants followed.<\/p>\n
In London this spring, Sawe and Kejelcha both broke two hours, and were both sponsored by Adidas\u2014but were wearing conspicuously different uniforms. Sawe wore a singlet in Adidas\u2019s Climacool+ line, with an array of embossed 3D dimples patterned across the chest. These dimples enhance airflow and prevent the fabric from clinging to the chest when it gets wet, according to Margherita Raccuglia, the director of Adidas\u2019s apparel innovation team. Wet cling isn\u2019t just an aesthetic issue: it interferes with the cooling effect of sweat evaporation. As a result, Raccuglia says, lab tests have shown the design helps keep body temperature lower, though she didn\u2019t give a number on how much.<\/p>\n
Kejelcha, in contrast, wore a one-piece bodysuit in the company\u2019s Techfit+ line. Normally you associate bodysuits with aerodynamics, or perhaps with compression\u2014a feature that has long been touted to boost performance, but has mostly failed to live up to the hype in lab tests. In this case, the suit\u2019s primary purpose is \u201ctargeted muscle support and joint stabilization,\u201d according to Raccuglia. As athletes fatigue, their posture and alignment degrade; strategically placed stiffening bands made of thermoplastic polyurethane run along the quadriceps and hamstrings, stabilizing the hips and pelvis. This is the effect that, according to Adidas\u2019s internal testing, boosts running economy by one percent.<\/p>\n
Will super pants sweep the endurance world in the same way that super shoes have? Before that happens, we\u2019ll need to see the purported benefits replicated in third-party testing. For elite runners, a one-percent improvement in running economy translates into a gain of two-thirds of a percent in race speed. At two-hour marathon pace, that\u2019s 48 seconds; Sawe ran 1:59:30 and Kejelcha ran 1:59:41, so this is a meaningful margin. Does it matter to the rest of us? The runaway success of super shoes, along with growing interest in the marginal benefits of products like carbohydrate gels and baking soda, suggest that the answer for many people is \u201cyes.\u201d<\/p>\n
Admittedly, I have a hard time envisioning myself in a tight one-piece bodysuit. Sawe apparently has similar feelings. Adidas\u2019s scientists hoped until the last moment that he was going to wear it in London, but he opted instead for the Climacool+ singlet along with Techfit+ half-tights, which are equipped with some of the same stiffening elements as the full bodysuit but don\u2019t provide quite as much support. When I asked Raccuglia whether that meant Sawe had left some time on the table, she diplomatically dodged the question. His choice \u201crepresented the optimal apparel combination for Sabastian Sawe at that specific moment and for the demands of that particular race,\u201d she said.<\/p>\n
In other words, FloJo was right: to run fast, you have to feel good. And feeling good will always depend on more than lab results, which is why the tension between fashion and function in athletic apparel will never entirely disappear. Still, if the positive results keep piling up, expect to see to more tight-fitting, dimpled, stiffened looks\u2014because free speed never goes out of style.<\/p>\n\n
This article is from the Fall 2026 issue of Outside magazine. To receive the print magazine, become an Outside+ member here<\/i>.<\/i><\/p>\n
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