The perfect outdoor performance sock featuring our famous Double Layer, Anti Blister System construction with the four-season comfort of Merino Wool. Take advantage of all the benefits of wool--soft fabric, quick-dry capabilities, and temperate-regulation--paired with our blister prevention double-layer technology! OUR MERINO WOOL SOCK FEATURES Merino Wool outer layer provides year-round comfort Inner Layer of Recycled Polyester to maximize moisture management Stabilizer Zone(TM) to help lock the sock in place Mesh panel for breathability Lightly cushioned footbed in the inner layer Blister-Free socks - No Blisters, Guaranteed! BLISTER-FREE MERINO WOOL SOCKS FIBER CONTENT These anti-blister wool socks are composed mostly of recycled polyester. Enjoy blister-free running adventures while protecting the ground beneath your feet! Inner Layer: 70% Recycled Polyester, 26% Nylon, 4% LycraA(R)Outer Layer: 68% Merino Wool, 24% Nylon, 8% LycraA(R) Double Layer Seamless Toe Wrightsock&';s Double Layer styles offer a seamless toe like most performance socks do these days; however, as you can see on the below images, Wrightsock&';s seamless toe looks a bit different. This is due to the required attachments that connect the inner and outer layers together for our Double Layer system. Even though it looks a bit odd, our seamless toe acts and feels the same on your foot as any other seamless toe design. ANTI-BLISTER WOOL SOCK SIZING GUIDE Finding the right fit is essential for blister prevention! You can view our sizing chart below. We invite you to contact us for any additional information or head to our FAQ page to find the answers to common customer questions. As an American-made, family-owned business, we thank you for choosing Wrightsock anti-blister merino wool socks.