SATURN 21% nylon Medium Cushion: Medium cushioning for impact absorption and long days on your feet Supportive arch brace Sock Height: Crew <span class="a-text-bold">Knit in USA</span>of Imported Yarn: 63% Merino Wool, 36% Nylon, 1% Elastane Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.