517eb1a1_Toppers___BedBathandBeyond_com__What_it_s_for
[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.
Buying Guide to Mattress Pads & Toppers - BedBathandBeyond.com
What it's for