The particular foam used in toppers has compression characteristics such that it "remembers" its pressure points for a short time, resulting in the commonly used term memory foam. After market toppers are often of great benefit when used with a mattress that is worn or uncomfortable. However, toppers are so effective that they are increasingly being integrated into brand new mattresses.
Some manufacturers contour the profile of their toppers in order to facilitate a specific air flow pattern.
In medical applications a "visco-elastic" foam topper is often used because of pressure relieving properties and this type of topper is also finding its way into the consumer market.
Since the "visco-elastic" foam topper reacts to both pressure and temperature, and this type of foam has a slightly greater density, they provide what is perceived by some to be a weightless sensation.
AirDream | Index for Glossary of Memory Foam Terms | Mattress Topper | Sleeper Sofa Replacement Mattress | Memory Foam