Patagonia Ultralightweight Liner Socks Daily-use socks, made of a fast-drying recycled polyester/nylon/spandex blend with HeiQ® Pure odor control, can be used as liners or on their own. Produced at a family-run factory in the United States. Style Number 49985 Ultralightweight Fabric Blend - Low-density knit for an ultralightweight feel 3/4 Crew Length - 3/4-length crew socks All-Day Comfort - Smooth feel allows easy layering under hiking or fishing socks Engineered Logo - Patagonia® logo is engineered into the socks for reduced bulk Large - M's 9 - 12 Made in the USA - Made at a family-run factory in the United States Materials ; 70% TruTouch™ by REPREVE® recycled polyester/28% nylon/2% LYCRA® spandex with HeiQ® Pure odor control