Smartwool's Hike Light Cushion Crew Socks are crafted from responsibly sourced ZQ-certified Merino wool and recycled nylon, offering superior comfort and performance for outdoor adventures. These socks, formerly known as PhD Outdoor, feature an updated 4 Degreeâ„¢ fit system for a secure, comfortable fit that stays in place. The Indestructawoolâ„¢ technology provides extended durability, while body-mapped mesh zones enhance breathability. Light cushioning runs along the entire bottom of the foot, ensuring comfort even on challenging terrain. The socks also include a virtually seamless toe for a smooth feel and a comfort welt with a stay-put fit. Key features include Indestructawool Technology with extended durability zones, 4 Degree Elite Fit System for a dialed-in fit, mesh zones for breathability, and a virtually seamless toe for enhanced comfort. Weight: 0.159 lbs. Country of Manufacture: Italy. Composition: 58% Merino Wool, 40% Nylon, 2% Elastane.