MERINO WOOL BLEND FEATURES: Thermal Merino Wool Keeps Warm in Cold Weather; Breathable Properties that Prevents Build-up of Smell, Moisture Wicking and ITCH-FREE; High Quality Merino Wool with SGS Certified 31.3% Wool Content MULTI-PART FUNCTIONAL DESIGN: Thicken Cushion for Comfor and abrasion resistance, Keep Warm; Elastic Provides Arch Support; Breathable Mesh Knit on the instep Maintains Breathability; Non-Slip Cuff that Ensures the Sock Stays Up