It doesn't get more sustainable than this: the wool is 100% Australian, biodynamic, merino wool – Demeter certified KbT, by IVN, Germany. The sheep are bred under biodynamic control. The soaps and spinnings oils used are biodegradable. The wool is not super-washed and no moth repellents are used. The dyes used do not contain heavy metals. The textile is woven, then milled without soap in cold water only. The sewing thread is 100% cotton, the label is 100% polyester, both in Eco-Tex standard 100. Made in Denmark (obviously).