Wool knit hat from Palmer Station, Antartica.

Palmer Station is located on a protected harbor on the southwestern coast of Anvers Island off the Antarctica Peninsula. Palmer is the only U.S. Antarctic station north of the Antarctic Circle. The temperature is mild, with monthly averages ranging from minus 10°C in July and August to 2°C in January and February.

The station, built on solid rock, consists of two major buildings and three small ones, plus two large fuel tanks, a helicopter pad, and a dock. Construction was completed in 1968, replacing a prefabricated wood structure ("Old Palmer," established in 1965) two kilometers away across Arthur Harbor. Old Palmer has been disassembled and removed from Antarctica. Somewhat over 40 people can occupy Palmer in the summer. Wintering population is about 10, although Palmer does not have a long period of winter isolation as do McMurdo and South Pole.

https://www.nsf.gov/geo/opp/support/palmerst.jsp