United By Blue

United By Blue Classic Ultimate Bison Sock


Countless winters and near extinction have proven the might of the American Bison. Now, United By Blue has transformed this resilient animal's inner coat into an innovative, insulating yarn. Blended with superfine U.S. Merino, the Ultimate Bison Sock is softer than cashmere, warmer than wool, and perfect for hiking trails or relaxing by campfires

And rest easy knowing that for every product sold, United By Blue removes one pound of trash from the world's waterways.


  • Naturally temperature regulating and moisture wicking 
  • 1x1 Spandex rib knit welt 
  • Spandex knit throughout leg 
  • Reinforced heel and toe areas 
  • Spandex rib arch support 
  • Flat knit side panels 
  • Flat toe seam 
  • Made in USA


  • 62% Merino Wool
  • 18% Nylon
  • 16% Bison Down
  • 2% Polyester
  • 2% Spandex
  • Machine wash warm, inside out; tumble dry low


  • Small: Fits Women's 6-10, Men's 5-9
  • Large: Fits Women's 10-13, Men's 9-13