Shame on me for not checking the fiber content. I searched for wool hiking socks and these were included in the results. I love the colors, the length, fit, and cushion. (I’ve only worn them breaking in new hiking shoes on trips less than an hour.). I have other wool hiking socks that I don’t love the look of but they have cushion + absorb/breathe. We’ll see how these new socks do as we do day hikes in Theodore Roosevelt, Glacier, Arches, and Rocky Mountain National Parks + Thousand Springs StatSee full review