PATONS-Kroy Socks FX Yarn. The wool and nylon combination allows for washability and durability and the wool content wicks moisture away from the skin. Weight category: 1, 75% Washable Wool/25% Nylon, 166yd/152m. Suggested knitting needles: 3/3.25mm, crochet hook: D3/3.25. Care: machine wash, tumble dry, do not bleach, do not iron, do not dry clean. Imported.