We mixed extra-fine Wool/ Cotton yarn to get an all-season garment and benefits from 2 natural fibers. To keep up our responsibel work as a brand, we made the wool with RWS certification, and the long staple- cotton carefully selected from certified US. Pima cotton..The garment will be hangtagged with RWS. In adition we made it perform TOTAL EASY care, meaning u can treat in in the washing machine and even Tumbly dry it, if needed. have in mind this is a Merino garment, and have benefits of not needing to be washed so ofter, simply air it out when needed.