Memory foam consists of low-resistance, or viscoelastic polyurethane, and several other chemicals, such as hydrocarbons. Medicine ball sinking into Nectar Premiere’s memory foam Compared to polyurethane foam, this material is denser and more temperature-sensitive. Generally, it becomes softer and sinks more in response to body heat. ^{3 days ago · Over the years, memory foam has evolved to meet the diverse needs of consumers, with advancements in technology and manufacturing processes leading to the creation of various types of memory foam, including traditional, gel-infused, and plant-based formulations.} What is Memory Foam Made Of? Memory foam is a type of synthetic material called viscoelastic foam. It’s different from other foam because it has more resistance, making it an ideal material for mattresses. It’s soft and durable, with heat-wicking abilities that provide support for aching joints. Qj1ux.