Slub Q These quarter-length socks feature thick slub yarn for a bold yet understated look. While they may appear simple, they are crafted by pushing the knitting machine to its gauge limits, blending multiple yarn thicknesses to create a plush, voluminous texture with exceptional softness and depth. Construction : Rib knitting Composition : 66% Cotton 28% Acrylic 5% Polyester 1% Spandex. COO : Made in Japan Size guide : Size Medium : Length 5.0" and fit best for 25-28cm feet, approximately US Men's size 7-10 Size Large : Length 6.0" and fit best for 27-30cm feet, approximately US Men's size 9-12