ROTOTO R1515 Double Face Crew Socks in Lime/Light GrayROTOTO R1515 Double Face Crew Socks in Lime Light Gray. These double layer socks are knitted by skilled craftsmen with a hard to find machine in their small village. The surface fabric is made of colored cotton, while undyed silk is used for the lining. To bring the best out of the advantages of silk, such as moisture absorbency as well as heat and moisture retention, the liner fabric is finely knitted with a pile surface. 48% Silk, 38% Cotton, 6% PL,