How much do the cover, sheets, and room affect cooling?

A lot. Even a breathable mattress feels hot under thick fleece sheets, a heavy mattress protector, or in a warm room. Cotton, linen, and bamboo sheets vent heat well, while a waterproof plastic-backed protector traps it. The mattress sets the ceiling on how cool you can sleep, but bedding and room temperature decide how close you get to that ceiling.


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