Compression - Moderate (15-20mmHg) Graduated CompressionCushioning - Ultra Light Cushion Sole COMPRESSIONModerate (15-20mmHg) Graduated Compression CUSHIONINGUltra Light Cushion Sole FEATURESSpandex throughout the SockGraduated Compression LegTurn Welt TopArch SupportSeamless Toe Closure CONTENT32% Merino Wool31% Bamboo Rayon32% Nylon5% Spandex Sockwell socks are made from natural fibers, sourced right here in America. Fine Merino wool, bamboo rayon, lambswool and Alpaca blends provide performance, durability and sustainability. The natural properties of these fibers: Regulate temperature and moisture better than synthetic fibers Keep your foot drier by constantly absorbing and evaporating moisture Make you less likely to form blisters because there’s no friction from wet fabrics Reduce odor by keeping your foot and shoe dry Sockwell socks feature design elements like: Accu-fit technology for a great fit Arch and ankle support to fight fatigue and support your step Turn welt tops to prevent slippage Seamless toe closures to keep toes comfortable SIZE GUIDE At Sockwell, we've simplified sock sizing without making any sacrifices to the way your sock or its compression level fits. So you can put the tape measure away. At Sockwell, all you need is your shoe size! Find your shoe size in the chart below. If you're in between sizes, we recommend sizing up. SIZE WOMEN'S MEN'S EU small / medium 4 - 7.5 35 - 38 medium / large 8 - 11 7 - 10 39 - 43 large / extra large 10.5 - 13 44 - 47 extra extra large 13.5 - 16 48 - 50 WASH AND CARE Easy Wash Turn Inside Out, Machine Wash Warm, Tumble Dry Low Heat, Do Not Bleach. Caring Wash Machine wash cold, air dry. Better for the planet, good for your socks.