[Mattress Topper Type] Visco Elastic Mattress Toppers [What it's for] 
These mattress toppers, sometimes called memory foam, are designed to provide additional support to sleepers. They conform to the body because they're made with a temperature-sensitive material that contracts more where the body is warmer, but stays firmer where the body is cooler. Another benefit? These mattress toppers can also dampen motion when a sleeper moves. Visco elastic mattress pads are placed on the bed underneath the fitted sheet.