From the Quince & Co. website:
Lark is a smooth, round, wool yarn, designed to showcase all manner of stitch patterns. Its firm 4-ply structure yields etched twisted stitches, fluid cables, and chiseled allover small textures. Lark is great, too, when you want a good yarn for well-defined color patterns.
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.