The first composite deck we had I didn't like because it was so hot on the feet and it got a little mildewy. The newer Azek is all pvc with no wood fiber in it and doesn't have these problems. My feet never get hot on our Azek and that was one of the things I did not like at all about the original (I think it might have been trex). Your best bet is go to your local lumberyard and ask for information about them.
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