WWI reproduction Khaki Wool Wristlets / Wrist Hand Warmers are made by Mom.
The Wristlets have a knitted opening in the weave of the wristlet for the thumb. One size fits most. Made in America.
The Wristlets are made of wool, so for best results, please wash by hand in cold water and lay them flat to dry, stretching them to their original size while still wet.