Foam vs spring? Better sleep on it.

Proportionately, fewer foam mattresses had notable sagging, but on the other hand, foam mattresses may not last as long if you're prone to sweating, perhaps due to a warmer climate or a health condition. Unlike the high-resilience (HR) foam used in spring and standard foam mattresses, memory foam models use a Lower response version of polyurethane that can contour around your body. Inside a foam mattress The core of a foam mattress is usually made of polyurethane or latex. FOAM VS MEMORY FOAM ALL memory foam mattresses are made of foam, but not all foam is memory foam. [Extracted from the article]