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Why does memory foam sleep hot?
In short
Classic memory foam has slower air exchange through its cell structure and softens with heat, which can increase warmth at the contact zone. Open-cell foams, gel modifications, thinner comfort layers over pocket springs, and lower-TOG bedding each change heat pathways differently.
More detail
Pocket spring cores often feel cooler than solid foam stacks of similar thickness, but thick foam on hybrids can still trap surface heat. See the heat and cooling materials guide.
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Updated 2026-08-03. All answers