Celtic Creation Irish Dance Poodle Socks Ankle Length by Arch Support for Irish Dancing (2 Pack) Sizing: X-Small= 8-10.5 (kid's) Small= 11-1.5 Medium= 2-4.5 (kid's) Large= 5-7 (Big Kids/adult) X-Large= 7.5-10 (Adult's) These are a more snug fitting Irish Dance sock. As stated by the designer of the Poodle socks: "These newly designed Irish dancing socks have become a best seller - they are made from extra soft cotton with a fitted foot, and seamless toe joins are inter-linked to reduce discomfort when wearing tight fitting irish dance shoes and irish dancing pumps" These are a more snug fitting Irish Dance sock with a seamless toe joints are inter-linked to reduce discomfort when wearing tight fitting irish dance shoes and irish dancing pumps. More elastic in the leg section to keep them up when dancing. Sizing: X-Small= 8-10.5 (kid's) Small= 11-1.5 (kid's) Medium= 2-4.5 (kid's) Large= 5-7 (Big Kids/adult) X-Large= 7.5-10 (Adult's)