SKU 9882151 The primary materials that compose this product contain a minimum of 20 percent recycled content. Keep your feet warm and enjoy your chilly weather adventures with confidence and style, wearing the Smartwool® Ski Zero Cushion Extra Stretch Over the Calf Socks. Crafted with extra stretch for greater comfort, these socks contain Merino fibers that provide outstanding softness and construction. They are infused with the Indestructawool™ technology which is engineered to provide maximum comfort and durability. With the wider welt, the socks offer a secure and comfortable fit. 4-Degree™ Elite Fit System construction uses two elastics to provide better stretch and to keep your sock in place. Shred Shield™ reduces wear and tear on the toes for added durability. Body-mapped mesh zones for breathability. 52% Merino wool, 31% recycled nylon, 13% nylon, 3% elastane. Machine wash, tumble dry. Made in the USA. View Zappos.com Glossary of Terms Smartwool Ski Zero Cushion Extra Stretch Over the Calf