Abstract: A mitten that encapsulates the full hand, inclusive of the thumb, within a single and uninterrupted chamber that creates a microclimate shared by the entire hand and allows functional articulation of the opposable thumb. The body of the mitt has a thumb projection webbed in appearance that prevents isolation of the thumb from the remainder of the hand, which serves to enhance thermoregulation mechanisms while maximizing biomechanical function and prehensile capability both within and as transmitted through the body of the mitt.