From the Quince & Co website:

Soft and skinny is our wispy Tern, a blend of wool and tussah silk. The yarn’s muted palette - think vintage painted photographs - results from the way in which the different fibers absorb dye. The wool portion colors thoroughly, but the silk is barely tinted. It’’s good for socks, scarves, mitts, hats, and any sweater that loves a little drape.

How to care for our wool and wool blends:
We recommend that you hand wash your wool project with gentle soap, such as Twig & Horn’s lanolizing Wool Soap, in cool water. If using a gentle soap such as Wool Soap, you do not have to rinse. If you use a regular detergent, rinse it thoroughly and gently press out extra water and roll it lightly in a terry towel to absorb more of the moisture. Lay your project out to the correct measurements and let it dry naturally. If you want to speed up drying, aim a fan at the drying surface.

If you’d like to try machine washing your wool and wool-blend garments (not recommended), use cool water and a gentle cycle. After spinning, lay your garment flat to dry. And never, never put your knitted wool garment in the dryer.