Aunt Lydia's Fashion Crochet Thread is a slightly heavier-weight crochet thread that is great for apparel, fashion accessories, home decor, and more. Recommended for crochet hooks size D-3 or E-4 and knitting needles size 2-3 (US). Care: machine wash on the gentle cycle, roll in towel, and block. 100% mercerized cotton. Size 3.