We did these for a big private label buyer; had a few left over. Same durable, soft and extremely warm mittens as our brown mitts, knit with Buffalo Gold's 90% Bison 10% Nylon. yarn; just professionally over-dyed black.
The American bison down traps your body heat within the air pockets naturally created by the spun bison down. The high moisture regain properties (the ability of the fiber to hold water without you feeling it) adds an even greater degree of comfort.
For winter work, fishing, driving, walking, arthritic/medical heat retention to keep your hands warm. 100 % made in the United States of America.