Cressi 2.5mm Core Vest Base Layer for MenThe Cressi Core Vest is a sleeveless neoprene base layer that can be layered under a wetsuit for extra insulation in cooler waters, or worn alone in warm conditions. Made from ultra stretchy 2. 5 mm neoprene, the Core Vest fits like a second skin and provides essential warmth around the core. Features A versatile 2. 5 mm vest that provides added warmth around the core when layered under a wetsuit. Ultra stretch neoprene ensures a comfortable, second