Recycled cotton blended with hemp results in a sturdy, durable sock! These are "medium thick" and make good work or boot socks. They also look nice with regular slacks or jeans! Made in the U.S. by E.G. Smith. From the label, "a portion of our profits will be donated to environmental organizations that support an end to global warming." 53% recycled cotton, 23% hemp, 13% nylon, 7% acrylic, 4% polyester.