Paton's Kroy sock yarn is sock weight: slightly lighter than sport. The wool and nylon combination allows for washability and durability; a combination designed to be easy care. The wool content wicks moisture away from the skin, an important feature. Socks are generally worked on a size 3 needle. Many patterns are available including books designed specifically for Kroy. Kroy's prints are spectacular...fast repeat colors that work up into subtle shade patterns.