Controversy has struck the middle stages of the 2026 Tour de France Femmes as some competitors have accused others of gaining an unfair, and illegal, advantage through the use of “bra boosting”.
Cyclists competing in the Tour de France Femmes have been accused of cheating after allegations have surfaced against unnamed women’s competitors of “bra boosting” to gain an advantage.
Dutch and Belgian news outlet WielerFlits revealed this week that several Tour de France Femmes competitors have lodged complaints against this as it is believed artificially increasing the size of depth of women cyclist brassiere’s has competitive benefits.
Also known as “chest fairing”, bra boosting increases the area of the chest by placing extra padding or other objects inside the sports bra and/or jersey.
This creates further openings for airflow to travel through the jersey and reduce wind drag, which can marginally increase speed and save seconds on lap times.
The Tour de France Femmes competitors who lodged the complaints have also anonymously asked for there to be female check officers in place to inspect if competitors have been intentionally stuffing their bras to enhance speed.
The International Cycling Union (ICU) has yet to release a statement surrounding the controversy.
The 2026 Tour de France Femmes (1-9 August) is in its fifth stage today. The first two days were won by Lorena Wiebes, with Sigrid Ytterhus Haugset winning day three and Marlen Reusser winning day four.
How much time can be saved with bra boosting?
Research in 2024 from Journal of Wind Engineering and Industrial Aerodynamics revealed bra boosting, or chest fairing, could see a competitor gain a time-trial advantage of 0.78 seconds per kilometer, reducing wind drag by 3.6%.
Speaking to The Times, Professor of aerodynamics at Heriot-Watt University in Scotland, Bert Blocken, has seen photographs of 2026 Tour de France Femmes competitors using sticks behind their shirts to gain a competitive advantage.
The issue of bra boosting was raised by Blocken during a meeting he held with the ICU in past years.
Through his scientific research, Blocken found that bra boosting gains a competitor a reduction in wing drag by 3.6% and can have a direct impact on the result of a race.
Is bra boosting illegal or gamesmanship?
According to Article 1.03.033 of the ICU’s regulatory framework, a cyclist is prohibited from the use of “non-essential” components to their clothing or equipment for safety reasons.
Clothing and accessories also can not be artificially modified to impact and/or change a rider’s body shape. This definition outright bans the use of bra padding to be used during competition.
Violations of these rules could result in immediate disqualification from ICU competitions and a fine; starting from 200 Swiss Francs to 1,000 Swiss Francs. More egregious violations could result in higher penalties or possible bans from cycling.
