Here is special yarn created with a patented technology. This single-ply, lightly felted yarn knits up easily and smoothly on large needles. It is made with the finest Merino Wool, thus creating a soft natural garment that can be worn directly on the skin. The eco-friendly dyes leave practically no trace of any chemicals, making this yarn a great natural choice for children and an approved yarn of the Waldorf Schools in Germany. Pur is not chemically treated to be a superwash and therefore should be washed by hand with cool water.