Smart Wool's Hike Light Cushion Crew, formerly PhD® Outdoor, is designed to help take care of your feet and elevate every hike. Smart Wool has updated our best hike socks to include more sustainable materials, improved durability and mesh zones, and an even more perfect fit. Smart Wool's top sock technologies and women's-specific fit work together with responsibly sourced, ZQ-certified Merino wool to help you perform naturally. Recycled nylon brings more sustainability to our sock construction, while light cushioning along the entire bottom of the foot paired with a crew height helps you get there on the most rugged trails and in any hiking shoe/boot. Bring more comfort on every hike with Smart Wool.