96% Cotton / 4% Elastine Bedford "Micro-Dobby" Stretch Pants with 60% Cotton, 40% Oystex (Recycled Polyester) liner. The Flanstones are exactly like our Bedrocks, only 10x warmer. They feature denim-style pockets and hardware, rivets at all stress-joints, back waist leather label, heavy-duty railroad button, fly closure, and custom labeling.