These underwears are kniited with a GOTS certified merinowool : http://www.global-standard.org
And this underwear is Nordic Swan certified :
Merino wool has exceptional qualities: thermoregulatory, antibacterial, supple and soft. Because it absorbs up to 30% of its weight in water and evacuates this moisture to the outside of the garment: it prevents the development of bacteria and therefore unpleasant odors. Merino wool is as thin as a cashmere fiber: IT DOES NOT SCRATCH.
A very special woolen fabric: thanks to a 16 hours special treatment in our dyeing workshop, we eliminate all the elements scraping wool. Our process is free of heavy metals or chlorine-containing compounds. So you get both the exceptional qualities of wool and absolutely clean and environmentally friendly manufacturing. Very soft on the body and thermoregulatory, these underwear are worn at home, such as nightwear, office, on construction sites, skiing, jogging or cycling.
Care instructions for merino wool: Machine wash at 30 degrees. Gentle detergent. Wool can be washed by hand, but should not be soaked for a long time. Wool does not appreciate the dryer or the spinning too strong. To protect this garment against moths, wash and dry at the end of each winter season and store in a closed plastic bag. You will enjoy your products longer.