"Sour Patch" Custom Nike Elite/art Socks by Sock Insanity. #storenvy #sockinsanity **Sock sizing is based on shoe size. Small is for youth 3-5, and ladies 4-6. Medium is for youth 5-7, mens 6-8, and ladies 6-10. Large is for ladies 10-13, and mens 8-12. X-Large is for mens 12-15.