The World Cup is in full swing, and as the nation prepares to watch the Three Lions, nationwide curiosity about why footballers have holes in their socks has emerged.
In fact, in the past week alone, UK Google searches for ‘holes in footballers' socks’ have surged by 479%*, following England’s victory against Croatia.
In light of the surge of interest, Bethany Tomlinson, a qualified physiotherapist with over 25 years of experience and Musculoskeletal Clinical Service Manager at AXA Health insurance, has revealed the exact reason behind this trend and how it can impact football performance.
Extreme temperatures can increase pressure in the calf
The 2026 World Cup is predicted to have some of the highest temperatures on record*, Bethany Tomlinson has revealed how extreme heat can increase pressure in calf muscles.
Bethany explains, "During high-intensity activities such as football, the calf muscles repeatedly contract, expand and work hard to generate power, stability and quick changes in direction. In extreme temperatures, the body works even harder to regulate its core temperature, increasing blood flow to the muscles and surrounding tissues.”
“This added demand can contribute to a build-up of pressure within the calf, leading to feelings of tightness, discomfort and fatigue. Combined with the physical demands of the tournament, hot conditions can place additional stress on the lower legs and may increase the risk of muscle-related issues if not managed effectively.”
Why footballers cut holes in their socks
With temperatures expected to reach 40°C throughout the tournament, Bethany reveals how players may look for ways to relieve pressure and discomfort during matches.
Bethany comments, “As the calf muscles work during a match, they naturally expand due to increased blood flow and the demands of repeated sprinting, jumping and changes of direction. This can create feelings of tightness or pressure in the lower leg, particularly when players are wearing tight-fitting socks.”
“By cutting holes into the back of their socks, some footballers aim to reduce compression around the calf muscle and allow it more room to expand during play.”
“While there is limited scientific evidence to show that the practice improves performance, many players report that it increases comfort and reduces feelings of tightness*.”
Methodology
*GLIMPSE UK Google Trends Search Data - correct as of 22/06/2026
*https://www.thenation.com/article/environment/the-hottest-world-cup-in-history/
*https://apexsox.com/blogs/news/why-do-footballers-cut-their-socks-secret-sock-tips?
