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The idea is to put some warmth over the kidneys/lower back. It works and works pretty well. I think Id like to have something for other parts of my body under a wet suit, but this is a real good start!
As far as a weight integrated BC goes, theyre clearly more comfortable than an "old school" weight belt. The Mares Mechanical Release System (MRS) is one of the easiest and most efficient integrated weight systems Ive used in some 30 years of diving!
this weight system isreally fool proof and reliable. Highly recommended