Gray.
Worn by NASA astronauts on space shuttle missions and aboard the International Space Station, these are the socks updated for earthbound wear with rubber soles. Astronaut's Slipper Socks - Men's - Medium - Grey Imported. The warmth and durability of twisted rag wool hug the foot from toe to the mid-calf. Further cushioning and insulation from cold wood or tile floors are provided by the memory-foam footbed, microfleece lining, and cow suede leather outsole and suede sidewall.