Lionesses in England have been photographed with special lenses that may be the key to overcoming jet lag. The European champions embarked on a long-distance adventure to Australia on Wednesday, just days before the highly anticipated Women’s World Cup in Sydney.

Keira Walsh, Ellie Roebuck and Georgia Stanway were seen wearing sunglasses to combat jet lag. In a tweet, the Lionnesses wrote: “Time for chrono goggles. Doing everything possible to beat the jet lag.”

The $325 goggles are made by Netherlands-based Propeaq, who claim they they can keep body and mind alert at the right times.

“Fatigue, drowsiness and inattention reduce performance on a business trip or spoil the fun on vacation,” Propeaq explains on its website.

“Prepare your body for the different time zone by setting the biological clock to the right time. This way you avoid this unpleasant feeling”. Jet lag, known as jet lag, circadian rhythm disorder, is a temporary state of sleep caused by a mismatch between the body clock and the external environment. It usually occurs as a result of rapid air travel across multiple continents and time zones.

Propeaq glasses are intended to mitigate the effects of jet lag the use of interchangeable lenses with blue and red filters. Dr. Neil Stanley, an independent sleep expert, says that while this concept is far from new, it is based on scientific beliefs. “What tells us it’s time to sleep is the absence of blue light, think of every sunset, they’re usually red or pink. The absence of blue tells us to go to sleep.

Propeaq also adds that the blue light reduces the production of melatonin, also known as the night hormone. Instead, it promotes the production of cortisol, the hormone known to drive action, giving you the idea that it’s daytime. To use the glasses correctly, Propeaq advises users to link them to their application. Flight times and time zone information can be entered here, so that Propeaq can better inform users when to change the lens colour.

“Your biological clock is tuned to sunrise and sunset,” explains Propeaq. That clock can be moved, but that can only happen for a maximum of 1.5 hours a day without bothering you.