A study commissioned by Greenpeace Germany and conducted by two independent laboratories has found that many of the most popular outdoor clothing companies use toxic chemicals in their clothing. Researchers tested 14 rain jackets and trousers, produced by a number of companies including The North Face, Patagonia, Marmot and Jack Wolfskin and found largely the same results across the board. Every one of the items of clothing tested positive for perfluorooctanoic acid (PFOA), a persistent hormone-disruptor used in the production Teflon and other chemicals which can contaminate drinking water, food, and potentially even human blood and breast milk.