The jacket, because of its design, is more waterproof than the vest and, if it has an effective tightening system, such as a neoprene band, closes more firmly around the neck. The size must be chosen correctly and should also close with a band. Efficient yes, but less convenient to put on than a vest. The vest though, is more difficult to seal. It is necessary to use models that hold squarely at the collar, with hermetically sealed or double pockets. The seams must also be sealed and fitted with a flap closure.