Sock Height: Over-the-Calf Indestructawool™ technology for enhanced durability 4 Degree™ elite fit system for a dialed-in, performance-oriented fit Shred Shield™ technology reduces wear from toes Wider welt for secure fit and comfort Body-mapped mesh zones for added breathability Made in the USA of Imported Yarn: 54% Merino Wool 12% Nylon 30% Recycled Nylon 3% Elastane 1% Polyester *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons. SW002183 Non-cushioned and slim fit for less bulk and enhanced comfort providing a breathable barrier between your foot and boot.