Saucony Men's Kinvara Micron Merino Wool Quarter Socks 73% Wool, 25% Polyester, 2% Elastane Imported Machine Wash Micron merino wool - finest micron wool in the r performance market Spandex knit in every stitch for superior fit Tapered toe construction - contact/dynamic fitting box Moisture wicking Temperature regulating (wool has hallo core)