Take our most popular lightweight no-blister style, Coolmesh ll socks. Add merino wool to the outside layer only. Now you have a super lightweight design with all the values of wool - natural moisture absorption, temperature control, no smell and best yet - no woolly scratch against the skin. Terrific for hiking, trekking, backpacking, and trail running. OUR BLISTER-FREE HIKING SOCK FEATURES Mesh panel for enhanced air flow Recycled Polyester performance fibers improve moisture management and increased durability Stabilizer Zone(TM) in arch locks sock in place Styles and colors for all tastes Blister-Free socks - No Blisters, Guaranteed! ANTI-BLISTER HIKING SOCKS FIBER CONTENT Inner Layer: 70% Recycled Polyester, 26% Nylon, 4% LycraA(R)Outer Layer: 71% Merino Wool, 24% Nylon, 5% 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 HIKING SOCK SIZING GUIDE Finding the right fit is essential for blister prevention on long hikes! You can view our sizing chart below. We invite you to contact us, 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 hiking socks.