Those awesome socks are the Summer Sliding socks (rav link) in my absolute favorite yarn Tempted Good Grrl. The yarn he sent me is Dye Dreams Twinkle Toes, a 50% merino/50% tencel blend sock yarn in the colorway Caribbean. He bought it at... wait for it.... RHINEBECK! I've totally got to go there some day.
A great big thank you goes to Logan and Cody! I love ya'll.