Smartwool's Hike Light Cushion Crew, formerly PhD® Outdoor, is designed to help take care of your feet and elevate every hike. Smartwool have updated their best hike socks to include more sustainable materials, improved durability, updated mesh zones, and an even more perfect fit. Top sock technologies work together with responsibly sourced, ZQ-certified Merino wool to help you perform with natural fibers. Light cushioning along the entire bottom of the sock brings more comfort to your favorite hiking shoe or boot. Recycled nylon brings more sustainability to Smartwool's sock construction and a crew height helps keep you covered as you set out on even the most rugged trails. Bring more comfort on every hike with Smartwool.