Pinnacle Merino Lined 5mm Hooded Vest Men's Pinnacle Merino Lined 5 mm Hooded Vest Men's Merino Lining System: 35% Warmer than Traditional Neoprene Lining Merino Lining: Antibacterial for Hygiene and Reduced Odor Great Stand-Alone Warm Water or Layering in Temperate or Cold Water 5 mm Hood with 3 mm Sleeveless Vests