This is an Art Sock. Cable upon cable swirl down the leg and foot from a twisted-rib cuff to describe Oregon's Cascades.
a volcanic mountain range, extending from central Oregon into British Columbia. The peaks of Mt. Hood. Mt. Rainer, and Mt. Saint Helens are visible from the city of Portland, creating a picturesque horizon throughout the year. The Cascade Locks, located outside Mt. Hood, are a series of waterfalls and canals that were built during the 1870s to make the Columbia more navigable. - Knit Purl Sock Club blurb
The pattern is Cascade Locks by Sarah Worthington. The back differs from the front and, front or back, there's a lot going on here. (Click on any photo to make larger.) The front has water flowing over and under and around cables. On the back of the sock, the water flows wider and more orderly.
Sure, a person can buy socks at Target but not these socks.