Harry Styles was seen wearing denim cut-off shorts and a Xanax t-shirt during his record-breaking London residency. The singer, 32, had previously debuted shorts during a show on Friday night and sported a teal pair on Tuesday evening. This fashion choice came as the UK experienced its hottest June day on record and a severe heatwave.

During a performance on Tuesday, Styles wore the shorts with a pink shirt and crop top as temperatures inside the stadium reached 34 degrees Celsius (93.2 degrees Fahrenheit). He engaged in a playful exchange with a fan who complimented his new attire, responding, "I actually wasn't sure if any of you had noticed, thank you so much. Because the last thing I needed was a self esteem boost!" Styles, who is in the midst of a 12-night run at Wembley Stadium, said he has been "having a blast" on his "Love On Tour."

The extreme weather prompted Wembley Stadium to relax its water bottle policy, allowing concertgoers to bring in metal or hard plastic bottles, and offering half-priced water and free sunscreen. Styles also urged the approximately 80,000 fans at his shows to "look after each other" and stay hydrated.

The heatwave led to a red health alert across the country, with temperatures forecast to approach Britain's all-time record. The Army canceled ceremonial operations in London and Windsor, and travel services faced potential disruption. The highest temperature recorded in the UK on Tuesday was 34.6C in Wisley, Surrey.

Beyond the stage, Styles has maintained a rigorous fitness routine. He was photographed running 10 kilometers (approximately 6.2 miles) from his home to the Wembley concert on Friday. Known for his marathon running, Styles has previously completed the Tokyo Marathon in 3:24:07 and the Berlin Marathon in under three hours, with a personal best of 2:59:13. He has spoken about running as a way to process his experiences and find solitude away from the pressures of fame.

Analysis of Styles' concert setlist has suggested that the physical exertion for fans during his shows, combined with the heat, can be comparable to a HYROX fitness event. Researchers estimated energy expenditure based on track BPM, duration, and additional activity like walking to and from the stadium, finding that by the halfway point, energy output matches running a 10K in 60 minutes.