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 actually quite soft and plush. Unlike classic wool, merino wool doesn’t work real 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 hells 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 really long time.