FoxRiver Zermatt Over-The-Calf Ski Socks 100% Other Fibers Made in US Take on any challenge in these lightweight, cushioned and stylish MERINO WOOL SOCKS Made from the sustainable fibers of TENCEL and Merino wool, THEY'LL KEEP YOU WARM AND DRY Our Helix Fit System offers an unmatched fit with FULL-FOOT VOLUMETRIC COMPRESSION Volumetric compression fit system ENSURES THE MOST ACCURATE PERSONALIZED FIT from your calf all the way to your toe MADE IN THE USA, these cold weather socks have VENTED PANELS TO REMOVE MOISTURE AND KEEP YOU DRY