Our Merino Wool Marleds are made with twice the amount of yarn of a standard crew pair of socks making these our warmest, most heavy-duty pair yet. These chunky socks are made by twisting black and naturally white merino wool yarns together and feature a rib-knit pattern throughout the calf and sole of the foot. Also available in Black & Burgundy. Small = women's shoe 5.5-9, men's shoe 4-7.5 Large= women's shoe 9.5+, men's shoe 8-14 Made in North Carolina, USA. Cushioned Footstep: super soft padding for extra comfort Arch Support: like a nice hug for your foot Seamless Toe: no more annoying bump at the tip of your toes Y-Stitched Heel: better fit and no more bunching No-slip Cuff: Keeps your socks where they belong