3 PAIR -30 BELOW THERMAL WINTER SOCKS (MERINO WOOL) 30% nylon Content- 70% Merino Wool & 30% Nylon Pre-Shrunk Merino Wool - Merino Wool is the finest quality of easy care wool for exceptional warmth and softness. Wool features inherent qualities such as wrinkle resistance, colorfastness, shape recovery (resiliency), and is very breathable X-Hi Cushion - XHi full terry cushion for added comfort, extra warmth, and protection Please note that ONLY the Large size are plain and DO NOT have any writing (ICELANDIC OR LINE ACROSS TOE) on them! THE -30 BELOW XLR SOCKS ARE IDENTICAL TO THESE BUT THEY HAVE A BETTER CUFF (WON'T SLOUCH) & ARE NOT SOLID COLOR (MIXED WITH BLACK)