How does the cold affect us during cold water actitivies?

Being exposed to cold conditions causes reduction of blood circulation to your extremities and increases your air consumption.  The body wastes energy trying to stay warm.   Finger dexterity, co-ordination and fatigue reduce your ability to perform certain skills required for optimum performance in sport.  With thermalution your core temperature stays warm and your body has more energy to keep you performing for longer.  Anyone who has been white water rafting or jet boating in a New Zealand winter can attest to how cold it can get.  Especially with wind chill.  Wearing a Thermalution undersuit beneath a life jacket not only keeps you comfortably warm but can prevent hypothermia in an emergency situation.