The Explore/Travel Crew sock is your most versatile sock for seeing the sites on your "Once in a Lifetime Vacation" or going to the office! This product leads our new ECO Collection engineered with Recycled Polyester. The perfect combination of eco-friendly sustainability while amazingly soft, breathable and durable -keeping you comfortable, and blister-free 3.5 plastic bottles used in each pair! Features Over 3.5 plastic bottles used in each pair of socks Recycled Polyester inner and outer layers Stabilizer Zone(TM) in arch locks sock in place High needle count for added durability Certified, Sustainable and Blister-Free socks - No Blisters, Guaranteed! Fiber ContentInner Layer: 70% Recycled Polyester, 26% Nylon, 4% LycraA(R)Outer Layer: 68% Recycled Polyester, 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.