Does this mattress sleep hot?

It runs reasonably cool for foam, scoring 7.7 out of 10. Peak surface temperature stays in the low-30s Celsius range. Because it is only 4 inches with a thin poly comfort layer over a firm core, there is not much dense foam to trap heat against you. It will not actively cool like a hybrid with a spring layer, but it sleeps cooler than the typical thick foam mattress, which suits a kid's bunk or guest bed.