I have a heavy drysuit undergarment for sale. It is a double layer felt- like material. Probably close to a 500gm weight. It is an XXL & I had it altered to fit my length. At the time I got it I was 230 lbs & 5'6" tall. I only used it once. It was too bulky to fit well under my drysuit. Asking $50 + S & H.