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THERMALS
Filson Thermal Underwear
Alaskan Smooth Wool
Filson Long-Johns Top
Alaskan Smooth Wool
Filson Long-Johns Zipneck Top
Filson Long-Johns are made with the finest Merino wool for warmth, durability, and comfort. Once you feel Filson Alaskan Long-Johns next to your skin, you'll never settle for synthetic thermal underwear again!