1. A multi-mode hand covering, comprising: an elongate tubular portion having an inner space, and a hand insertion end into which a person's hand may be inserted and a forward terminal end;
an opening in said terminal end through which said person's hand may be passed;
a palm side of said tube corresponding to a palm of said inserted hand;
a back side of said tube corresponding to a back side of said inserted hand;
a thumb enclosure extending outwardly from the palm side and communicating with said inner space for enclosing said person's thumb; and
a pocket extending generally from said terminal end to a pocket opening generally spanning said palm side proximate said thumb enclosure;
wherein said pocket is operable between a palm position wherein said terminal end opening is open to the atmosphere for passage of a person's hand therethrough for exposure thereof, and a back position covering said terminal end opening whereby said hand is fully covered.