Cotton Dress Socks &ndash; Men&rsquo;s Crew Socks - Men's Boot Socks - 98% Cotton - 3 pk and 6 pk - by Topfit (11-13, Black 3-Pk) 98% cotton 2% spandex fabric blend Reinforced toes & cuffs Anti-fungal - absorbs moisture efficiently Exceptionally comfortable and well made SHOE SIZE CHART: Sock size 11-13- fits US shoe size 7-10 / European shoe size: 40-44. Sock size 12-15- fits US shoe size 10-13 / European shoe size 44-48.