The Bare 5/3mm Ultrawarmth Mens Hooded Vest is designed to keep you warm throughout your core and head. It contains high-loft Ultrawarmth OMNIRED Infrared Thermal technology embedded in the inner fabric. OMNIRED is scientifically proven and FDA-determined to conserve body heat and accelerate thermal recovery. GEN2 hood vent allows trapped air to escape and prevents water from entering, while skin-in face seal—and neck seal that mates with the wetsuit collar— prevents water flushing. Ultrawarmth Hooded Vests can be worn inside or outside your wetsuit and can be added to any wetsuit for added core warmth.