Bamboo Pop Sock is a nice yarn to substitute for those who do not prefer wool. It contains 492 yds. on each 100 gram skein of 55% Bamboo and 37% Cotton with 8% PBT. Bamboo Sock Pop knits to 30 stitches and 36 rows in four inches on a US 1. Machine wash cold and gentle, but lay flat to dry. Made in Turkey.