The heat is on

Cathrin Persson has worked in Sweden’s steel industry since 1998. Every morning as she dresses for work, the welder faces the same problem: there are few heat- and fire-resistant underwear options on the market, and none are designed for women.

So, like most steelworkers, she makes do with normal underwear, which is less than ideal because cotton burns easily and retains heat. For women, regular garments fail to provide adequate coverage around the chest.

“When you’re welding, there are sparks flying,” Cathrin explains.

“They fall down on you like rain. They make holes in your gear, and eventually, they get on your skin, where they don’t stop until they run into something. This is usually the bra, for females.”

Thanks to technology used in space, however, Cathrin’s morning routine could soon change. Using Nomex, a highly resistant fabric used in astronauts’ suits, the Swedish underwear company Björn Borg has come up with prototypes for modern undergarments designed specifically to cope with the extreme conditions of a steel mill.

Dubbed “Thunderwear,” the new line was launched at a fashion show in Stockholm this summer.

One of five steelworkers who modelled it on the catwalk, Cathrin was impressed with the Nomex: “They held it over an open flame, and it didn’t leave any mark.”

Even more importantly for a woman who works where steel is baked at temperatures of up to 1050ºC, the high-tech material does not hold heat: “I touched the fabric immediately afterward, and it was lukewarm.”

The garments owe their existence to ESA’s Technology Transfer Programme (TTP). Last year, Sweden’s TTP Network broker Cecilia Hertz, of Umbilical Design, came across the problem when talking to representatives of Jernkontoret, Sweden’s Association of Steel Producers.

Next, she contacted the underwear makers Björn Borg, who expressed immediate interest. Finally, Cecilia put out a call to the broker network looking for a suitable material from space. 

Speaking with TTP's network of European brokers, both UK broker STFC and Italy’s D’Appolonia recommended Nomex. As this flame-resistant material is used in astronauts' suits, experience showed it could maybe fit the bill.

“We have a background in protective garment materials, and we suggested a couple of options,” said D’Appolonia’s Andrea Maria Ferrari.

Andrea was impressed with how well Björn Borg was able to adapt Nomex’s high-tech material – usually quite rough to the touch – for use in underwear.

ESA astronaut Christer Fuglesang, who attended the Thunderwear fashion show,wore Nomex gear in space (though not in underwear form – astronauts wear their own underpants for regular work in space): “These things show how we can use space technology on the ground, and to change society.”

Umbilical Design is now looking to bring Thunderwear to the market.

This suits Cathrin: “I would really like to have thisunderwear in my current job. It’s really hot. With these, you could get the heat on you, and you won’t get burned.”