Springs, foam or latex: what the layers do

Read a mattress from the top. The cover and the quilting decide the first touch; the comfort layer decides how much you sink in; the core decides how well you are held up (sample note).
Pocket springs are airy and bouncy. Memory foam is close and quiet. Latex is springy and cool. A hybrid puts one of the soft layers on top of springs.
That is why every card in our shop starts with a cross-section: two mattresses with the same name for their feel can be built very differently.