Death can result from too low a brain and heart temperature. Hypothermia, even mild cases, decreases crew efficiency and increases risk of costly accidents. Proper planning against hypothermia can give a winning competitive edge. Have proper foul- weather kit for all crew.
Dry suits are excellent.
Rotate watch frequently. Get plenty of rest, prevent fatigue. Eat and drink normally, no alcohol. Take into account special medical problems of crew members. Regularly train crew in Man Overboard recovery.