63% Mercerized Cotton, 36% Stretch Nylon and 1% Spandex ?Over the calf? length Constructed to be the perfect fit Available colors include: Black, Navy and Brown The modern production method for Mercerized cotton causes an increase in the surface area and reflectance giving the fiber a softer feel and more lustrous appearance. Other benefits of Mercerized Cotton are: Feels like silk when worn Resistant to Mildew Stronger than regular Cotton Retains dye longer causing the sock to maintain its vibrancy of color! Fits shoe size 6 - 12 ? For a larger view of this item, please click on the picture(s).