Over 25 years ago, Smartwool invented the original Merino wool performance sock-the Classic Hike. The Classic Hike remains mostly unchanged and certainly unmatched in comfort, but today, it&';s getting upgraded. And that upgrade starts with recycled nylon-creating a more sustainable (but just as comfortable) sock. They&';re also made with responsibly sourced, ZQ-certified wool that was grown with a focus on ensuring environmental, social, and economic sustainability while also taking the best care of our Merino sheep. This is a cozy, capable classic that is never going out of style.