For kids US shoe sizes 8K-13K(4-7 Years old),1-5 (8-11 Years old) and shoe sizes 6-10(12-16 Years Old),these socks hold up well after repeated washings. Super grips at sole of socks provide superb grip on slick surface such as wood floors,tile floors. Prevent falling or losing balance while walking or running. These grip non slip socks are made up of cotton,nylon and spandex, which are soft and comfortable for wearing; And the material makes kid ankle grip socks durable for long term use Enhance Your Performance,bring you more energy,make you jump higher,walk longer,climb higher,enhance your performance by the non-slip grip bottoms design. Superior Material to provide 360 degree stretch and flexibility,thick and protective,lasts longer! Super grips at sole of socks provide superb grip on slide surface such as wood floors,tile floors. Prevent falling or losing balance while walking or running. Perfect companion socks for sports,such as soccer,football,basketball,baseball, gym,kickboxing,yoga,riding etc. Machine wash.