Ive got both the vass,chest waders, and a pair of Sonik 3 stocking foot breathable chest waders, supplied with boots. I use the breathables for freshwater rivers' and still waters, etc purely as they are lightweight, and are for warmer waters, for coast or cold weather sea fishing the Vass are better heavy duty,dont tear so easy and are better against the cold,as you can wear layered gear underneath, and stronger all round. I would stick with the heavy duty for sea fishing and forget about breathables during winter fishing..