SmartWool Men's Hike Medium Crew 66% Merino Wool, 33% Nylon, 1% Elastane Knit in USA Machine Wash Medium Cushion: Medium cushioning to absorb impact on the trail Flat knit toe seam Elasticized arch brace Sock Height: Crew Style: SW0SW130 Medium Cushion: Medium cushioning to absorb impact on the trail Flat knit toe seam Elasticized arch brace Sock Height: Crew <span class="a-text-bold">Made in USA</span>of Imported Yarn: 66% Merino Wool, 33% Nylon, 1% Elastane Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.