What gluing does is that the lumps of the convoluted layer are flattened, so no air can possibly pass through it.
What many manufacturers do, rather sneakily in my opinion, is not to glue together the layers at the side of the mattress. The can show off this new fangled layer to potential customers and instill the illusion that air can freely pass through the convoluted layer.
But let's suppose they claim that by not gluing the sides of the mattress, air can still circulate freely enough to cool the mattress down. This is clearly a lot of nonsense. The convoluted layer is first covered by the mattress cover itself, then by sheets, then by blankets, etc
Source link: http://www.americanchronicle.com/articles/viewArticle.asp?articleID=44127
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