PATONS-Kroy Socks FX Yarn. The wool and nylon combination allows for wash ability 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.