Knit sock with targeted compression zone

A knit sock integrally knit of a body yarn in circumferential courses and axial wales, and comprising:

• a foot portion and an ankle portion, said foot portion comprising a heel;
• a targeted compression zone formed with said sock, and comprising axially extending compression ridges spaced-apart from each other and extending axially from a first end of said compression zone proximate said heel to a second end of said compression zone, and each compression ridge comprising at least one pattern yarn knit with the body yarn, and wherein said compression ridges have different coursewise termination points at the second end of said compression zone, and wherein said targeted compression zone extends in a coursewise direction to occupy only a partial circumferential portion of said sock;
• and
• whereby the compression force applied by said sock within said targeted compression zone is greater than the compression force in directly adjacent areas of said sock.