3mm Vests can be worn as stand-alone items in warm waters, and they add tremendous warmth to any wetsuit. Pinnacle's Vests are constructed of the same materials that have made Pinnacle's wetsuits famous for warmth, comfort, and durability. This 3mm titanium lined neoprene sleeveless vest has large arm openings which allow freedom of movement. The super stretch neck opening make donning and doffing easy without a zipper. The vest is durable with its double glued and blind stitch seams and stress disks are applied at all internal seam intersections for added strength.