I've knit several pairs of socks. the first time i used 100% acrylic yarn and within a few weeks, they had holes in the bottom. right now i am knitting a pair using bernat roving yarn, which is 80% acrylic, 20% wool. i notice if i handle the yarn too roughly it will thin out and break while i am knitting. so i am wondering if that means the socks will wear out quickly too? so what is the best wool blend, bulky yarn for socks? sock yarn will not do because itis too thin. the socks are for my dad, who works outside in the winter and he likes them thick and warm. Thanks!