These Intraknit(TM) Ski Targeted Cushion Over the Calf Sock will take you from the first run to the last. Its graduated cushioning and cuff shape are uniquely knit to provide a breathable performance fit without sacrificing cushion, and the extended welt offers enhanced coverage. The "butterfly wrap" cushioning at the navicular bone and ankle minimizes hot spots and heel lift, while the reinforced heels add durability where you need it most. Plus, our Indestructawool(TM) technology, 4 Degree(TM) Elite Fit System, and strategically placed mesh zones ensure a top-tier fit, all-day comfort, and lasting performance. Design: Anatomical extended welt provides additional coverage and comfort Graduated cushioning and cuff shape uniquely knit to provide a breathable performance fit without sacrificing cushion Navicular bone and ankle area 'butterfly wrap' cushioning to reduce hot spots and heel lift Targeted heel reinforcement offers more durability in high wear zones Contains Indestructawool(TM), 4 Degree(TM) Elite Fit System and body mapped mesh zones technologies Additional Details Made in the USA of Imported Yarn: 52% Wool-Merino 44% Nylon 4% ElastaneMade in the USA of Imported Yarn: 52% Wool-Merino 44% Nylon 4% Elastane Targeted Cushion Ski: Targeted cushion puts cushioning and mapped mesh zones everywhere you need it for maximum comfort and breathability