I try to use merino wool and nylon yarn to knit socks. But I have also used 100 % nylon and it seems to work well also. Now I'm noticing lots of other materials like polymide or "poly" something-or-other in yarns, silk and bamboo in sock yarns. Can any of you give me your opinion on using any of these types of yarns to make socks? I always try to use Fine, Fingering, or Sport, #2 size yarn. This size fits into my shoes better, and, of course, the shoes of those I give them to.