Wool has many great properties for the active outdoor enthusiast, but if you're like us, it can be hard to get past the scratchiness of classic wool. Merino wool is a different story. This stuff isn't scratchy at all. In fact, it's quite soft and plush. Unlike classic wool, merino wool doesn’t work well in a sock by itself. For that reason, the Elder merino wool sock is made of only 60% merino wool with a combination of Acrylic, nylon, and Lycra to give the sock its shape and stretchiness. The merino wool used in this sock is treated so it won’t shrink or change shape after washing or prolonged use. Since outdoorsy people are tough on their footwear, we like these because they have reinforced heels and toes that not only give you extra padding and insulation where you need it but also adds much needed durability so your socks will last a long time.