Aqua Lung Men's Dynaflex 5.5mm JacketThe Dynaflex concept is completed by the 5. 5 mm step in vest. For colder water, you can simply add the vest over your wetsuit to add a layer and maximize the suit concept. In warmer waters, the vest can of course be used on its own as a shorty. Features: Ultraspan outer fabric and 4 way super stretch, tight weave fabric. This fabric is abrasion resistant and fastens using hook and loop fastener, so that your suit always looks good. Constructed using