Cooling breaks and gadgets won’t fully shield players

acclimatization is – At the 2026 World Cup, every match is being paused on a rigid schedule even when conditions vary. Three-minute hydration breaks are mandatory, but scientists say their cooling effect is limited and that some equipment may be more about comfort—or simply not pr

On June 17 in Dallas, England and Croatia reached the moment when the stadium signal always comes—22 minutes into each half, a stop FIFA requires. The players waited through it, and the crowd booed, as if the pause itself proved something was off.

The rules are the same regardless of the air. Three-minute hydration breaks are mandatory throughout the 2026 FIFA World Cup, splitting each match into four segments. Critics argue that this regimented interruption clashes with soccer’s looser rhythms. But the real pressure point isn’t the entertainment value—it’s whether anything is actually protecting players when heat becomes dangerous.

A large share of the tournament is expected to be played under strain. Around a quarter of the games this summer are projected to be held above 26 degrees Celsius—nearly 79 degrees Fahrenheit—on the wet-bulb globe temperature (WBGT) scale. according to an analysis by the climate science group World Weather Attribution. WBGT is meant to capture heat stress more realistically than a thermometer reading by accounting for humidity. sunlight. wind and air temperature.

Heat stress doesn’t just wear athletes down; it can change how they play. In soccer. the shift can be subtle. said Julien Périard. director of the University of Canberra Research Institute for Sport and Exercise in Australia: players ration their effort. running less in the second half and passing more rather than carrying the ball.

That’s where FIFA’s mandatory hydration breaks land—on the logic that dividing play and giving players a chance to rehydrate and cool can blunt overheating. Yet even the people most familiar with heat science say the cooling window is short.

Ollie Jay. a professor of heat and health at the University of Sydney. pointed to evidence showing heat stress is rising for people who exercise and play sports. tracking risk over the past three decades through work with the Lancet Countdown. “Things that we term heat waves are more frequent. they’re more intense. they last longer. and they happen early in the season. ” he said.

Jay also worries about the match-wide, one-size-fits-all schedule. “What’s been odd this year is the fact that they’re having them in every game. irrespective of the conditions. and that’s a little bit concerning. ” he said. He frames a practical problem: unnecessary pauses could undermine public support for breaks when conditions truly call for them.

And three minutes, Jay adds, may not be enough to cool a body under strain. “They’re taking these breaks in the sun,” he said. Périard agrees the pause can slow a dangerous rise in body temperature, but contrasts it with what would work better: a 15-minute halftime break in an air-conditioned room.

Lee Taylor, a sports performance expert at Loughborough University in England, is even more blunt: “It’s proven to be more of a commercial opportunity,” he said.

The debate quickly turns to what athletes do when the thermometer climbs. Jonas Werner. team physician for the Swedish national team—set to play the Netherlands in Houston on June 20—sees a balance between scientific reality and what the game can tolerate. “Should [the hydration breaks] be longer?” he asked. “Maybe, but that would severely affect the game.”.

Werner says Sweden has multiple cooling options available: cold showers. ice baths. cold drinks. sprays. cold towels. ice bags and ice vests. But comfort doesn’t equal physiological rescue. Ice bags and cold towels can make players feel cooler. Werner said. but experts say briefly chilling a small patch of skin doesn’t necessarily draw much heat from the body’s core. “They are ‘mostly for comfort,’ Werner says. “The scientific evidence for both tools is scarce.”.

Other products face the same scrutiny. Adidas has provided its 14 World Cup partner teams with a setup it calls the CLIMACOOL system—vests. jackets and overshoes filled with a cooling gel that the company claims can lower core body temperature by nearly one degree F. Werner disputes its feasibility. He said the system requires 12 to 15 minutes of use—“something no one does”—and described it as “troublesome” to deploy because the gear must be kept frozen and transported to the stadium in heavy. battery-powered coolers. Adidas did not respond to a request for comment.

That leaves one point nearly everyone converges on: acclimatization. Scientists are cautious about judging specific products without published evidence, but they agree on the most important intervention—getting the body ready for heat before competition.

Werner described how Sweden is approaching it. The Swedish team began acclimatizing at home. with players training in a climate-controlled room at Bosön. the Swedish Sports Confederation’s development center. and using a sauna afterward. More broadly. training and living in hot conditions can increase blood plasma volume. improve sweating and help athletes work closer to their normal limits.

But even acclimatization has boundaries. Taylor put it plainly: “What acclimation does is, it brings you closer to that ceiling,” he said. “We’re never going to get back to our true performance capacity [in extreme heat]. We’re just going to get closer to that.”

For all the engineering and rulesetting around hydration and cooling. the heat problem remains stubborn: short breaks and spot-cooling tools may offer relief. but they don’t replace preparation. The most effective shift may be the one fans can’t see—weeks of training the body to handle a world that. for more players and more matches. is getting steadily hotter.

2026 FIFA World Cup heat stress WBGT hydration breaks acclimatization heat and health sports medicine player safety cooling gels CLIMACOOL Swedish national team World Weather Attribution heat waves