Cooling vests become vital tool for footballers battling extreme heat

As football becomes increasingly fast-paced and physically demanding, extreme heat poses a significant challenge to even the world's top athletes. During summer tournaments, players frequently compete in temperatures exceeding 30°C (86°F), with humidity exacerbating the punishing conditions. The 2026 FIFA World Cup, hosted across North America, has once again highlighted concerns regarding player welfare during afternoon matches.

While water breaks and shaded benches are now common, cooling vests are quietly emerging as an indispensable tool behind the scenes. These garments, which may resemble ordinary sleeveless jackets, represent years of sports science research aimed at helping footballers maintain peak performance when temperatures soar. The principle is straightforward: lowering an athlete's core body temperature before and during a match delays the onset of overheating once play begins.

Footballers generate substantial metabolic heat during ninety minutes of high-intensity activity. As core body temperature rises, fatigue sets in more rapidly, and recovery becomes more difficult. Cooling vests are designed to mitigate this process. Before kick-off, players often wear vests equipped with frozen cooling inserts or circulating chilled liquid. This pre-cooling process absorbs heat from the skin, gradually reducing body temperature and allowing players to start matches cooler, thus extending the time before heat stress impacts performance.

Many professional teams utilize phase-change material (PCM) technology, where inserts melt at specific temperatures, typically around 15°C (59°F). This material absorbs heat while maintaining a stable cooling temperature, preventing players from becoming excessively cold. Some elite centers employ liquid-cooled garments connected to portable circulation systems, pumping chilled water through embedded tubes. This gradual cooling method avoids the discomfort and muscle stiffness associated with direct ice application. Studies indicate that lowering core temperature before exercise can improve endurance, reduce perceived exertion, and delay heat-related fatigue, enabling players to maintain sprint intensity, concentration, and technical execution longer into matches.