Hello all! I am new to the forum as a member but have been a reader for a while now. Is the recommended the 2lb cross-linked polyethelyne or the 3lb? The 2lb is not only cheaper, but also the 3lb is obviously a lb heavier per cubic foot. I am thinking about getting a 1/4" piece and a 3/8" piece that will take me to 5/8" total for winter use and I can just use the 1/4" piece for summer. http://www.foambymail.com/Minicel.html