Looking for the ultimate cushion and wool sock? The Merino Extreme is our most cushioned, blister-free outdoor performance design yet. This Double Layer performance style works from the inside out to keep your feet feeling dry, comfortable, and blister-free. The inner layer of these performance socks uses Merino Wool to wick away moisture and cushion the heel to toe to keep you comfortable. While the outer layer provide maximum protection from blisters using a second layer of Merino Wool, for added comfort and durability while hiking, trekking, trail running, or backpacking. No matter where your next adventure takes you, have a more comfortable experience in Wrightsock&';s Merino Extreme. BLISTER-FREE HIKING SOCK FEATURES: Blister Free socks - No Blisters, Guaranteed Seamless toe Moisture management yarn to keep your feet dry Anatomical heel pocket for the perfect fit Max Cushion- Extra cushion for extra protection and warmth Merino- Odor resistant, temperature regulation, sustainable material Sock has Merino cushioning on the inner and outer layer for dual protection and warmth FIBER CONTENT Inner Layer: 70% Merino Wool, 26% Nylon, 4% LycraA(R)Outer Layer: 68% Merino Wool, 24% Nylon, 8% LycraA(R) These anti-blister hiking socks are composed sustainable yarn with the vast majority being natural Merino Wool and our Nylon and Lycra are composed of recycled materials to boot helping you enjoy blister-free hiking adventures while protecting the trails beneath your feet. 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! 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.