A foot warmer designed to keep warm the foot of a patient with a foot injury, a patient recovering from foot surgery, a person with chronically cold feet, or a person who lacks the small motor skills to put on regular shoes. The foot warmer, made from soft, cottony material with a non-slip bottom surface as its sole, has a sole attached to a lower member which attaches to an upper member that covers the in-step. Two flaps attached to the upper member fold over on top of the other side of the upper member and fasten together with long fasteners that give a very wide, gentle degree of comfort and warmth to the foot.