AquaThermal Vest VT-34M-AT

Design for user who require maximum mobility without 
  sacrificing comfort and warmth
Large armhole and lowcut neck line protect trunk while allowing 
  maximum mobility for strenuous exercise
Vest can worn as either a stand alone garment or even underneath a
  wetsuit, providing additional warmth and protection from wind-chill
It's perfect dressing combination if put Aropec Outdoors  
   Warmbase Underclothes (Aerosphere) then add AquaThermal Vest