I'm 6'4 260lbs, and I have the wbbb double 1.7. i find it very comfortable. I also have a DIY that I made for a friend of mine who is 6'11 475lbs. I used three layers of 1.9 nylon. It wasnt hard to do, just had a lady from the local sewing club stitch it up. It ended up being 14' long and 118 inches wide.