The Lt Hike blister-free sock is part of our new ECO product line engineered with recycled yarns! Made using recycled polyester yarn and Recover RWoolA(R), this exciting product is amazingly soft, comfortable, durable, AND sustainable. It&&';;s a breathable lightweight Double Layer sock and is designed for an outdoor performance fit. Ideal for light hiking, walking, trail running, and casual wear. Nearly 2 plastic bottles used in each pair combined with Post Industrial wool scraps! Our Blister-Free Sock Features Eco-friendly - Made using Post Industrial wool scraps and recycled PET bottles Recycled Polyester inner and Recover RWoolA(R) outer Stabilizer Zone(TM) in arch locks sock in place Versatile design for everyday High needle count for added durability Certified, Sustainable and Blister-Free socks - No Blisters, Guaranteed! Fiber Content Inner Layer: 70% Recycled Polyester, 26% Nylon, 4% LycraA(R)Outer Layer: 71% RWOOLA(R) Upcycled Wool, 24% Nylon, 5% LycraA(R) Our Eco Lt Hike Crew Socks are made with RepreveA(R) Polyester. RepreveA(R) yarns are made from recycled plastic bottles, helping you enjoy blister-free 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. Blister-Free Sock Sizing Finding the right size is essential for preventing blisters. You can read our sizing chart below for help getting the perfect fit. Please contact us for any additional information, or head on over to our FAQ page for answers to common customer questions. As an American-made, family-owned business, your support means the world to us. Thank you for choosing Wrightsock.