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Socks made of various fibers that reduce chances of blisters
May '10
Empa researchers and experts from armasuisse have developed novel socks which reduce the chances of blisters forming on the wearer's feet. The prototype footwear, made of various fibers, reduces friction at the toes and heels, absorbs perspiration and has a particularly comfortable feel. At the beginning of May the socks were subjected to a hard test at the Aarau barracks – sixty recruits wore the socks on daily route marches. Together with new combat boots, the socks form a part of armasuisse's “New Footwear” project.

There is almost nothing that new recruits fear more that the painful blisters which develop during the first route marches when “square-bashing”. “Wear wool,” is the advice from one corner. “Always wear two pairs – thin stockings underneath hiking socks!” counsels another veteran.

Wool, hiking socks and fine stockings – these traditional items now faces serious competition from Empa's textile laboratories. On behalf of armasuisse, the national competence center for the procurement of technically complex systems and materials, scientists from the institute's Protection and Physiology Laboratory together with the sock manufacturer Rohner have developed these novel socks. The main requirements to be met were that the socks should be as comfortable as possible, avoid rubbing the skin, and that the fibers should take up and store sweat as quickly as possible.

Developed in the laboratory but strictly for practical use
Selecting the most suitable textile material for the socks from all the fibers and fiber mixtures available took a fair amount of time. In the end, the researchers chose to make the material used for the heel and toe sections of the socks – the main trouble spots – out of a special fiber, while the rest of the garment is made of a woolen mixture which absorbs dampness particularly well.

But the story does not end with developments in textile technology. After the research work on the new material in the laboratory, the novel socks were tested for their wearing properties. This meant involving Empa specialists in the fields of thermodynamics, physiology and tribology (frictional effects) in the project. Not only were the innovative socks tested on a sweating dummy foot developed jointly by Empa and armasuisse, but scientists also had soldiers in battle dress marching on a treadmill in the climate chamber.

In order to learn as much as they could about how the material behaved during the process of walking, researchers from the Technical University of Chemnitz analyzed the biomechanical properties of the soldiers' combat boots. In actual fact, in the ideal case the boots exert the necessary pressure on the socks to allow optimal absorption of perspiration by the fibers. Boot and sock therefore create an optimal humidity transport system. The result for the user is that the socks rub less, transport sweat faster away from the sensitive areas of the skin and are comfortable to wear.

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