This post lists facts about Polyurethane foam (also known as Urethane), a light firm hydrothermal insulation material.

XPS (Extruded Polystyrene) is a great insulation material since it is moisture resistant and has high thermal performance.

PE foam, also known as Polyethylene foam is a class of thermoplastics, mostly used for packaging, insulation and cushioning

EPP foam (Expanded Polypropylene) is comprised of plastic beads fused together under steam heat and pressure, mostly used in packaging.

The post explains what is memory foam, its origin, its components and what makes it have memory