Here is the perfect addisiton to the 7mm backzipper wetsuit. This hooded vest provides a hybrid mix of neoprene with a 6mm hood, the norm for cold water diving. Then transitions into a 5mm vest for the needed layer over the body's core to provide extra warmth against the cold ocean water. And lastly, the vest incorporates a 3mm stretch panel along the sides of the ribs to allow easier expansion and contraction of the rib cage. This comes in handy during heavey exertion and deep breath-ups required during freediving preparation. The vest cna be worn under the suit for maximum water protection, or over the suit which allows the vest and hood to be removed easiuer between dives or while kayaking on the surface.