Memory foam consists mainly of polyurethane as well as additional chemicals increasing its viscosity and density. It is often referred to as "viscoelastic" polyurethane foam, or low-resilience polyurethane foam (LRPu).
Pocket Spring Mattresses are made up of individually pocketed set springs. These springs are independent of one another and are not linked to each other as in the case of Bonnell or other forms of spring mattresses. The great advantage of pocketed spring is that motion at one end of the bed is not transmitted to the other end of the bed.
Too often in interior design, we see wall art or paintings treated as an afterthought. They're what gets dealt with last, long after the final coat of paint has dried on the walls and all of the furniture has been artfully arranged, if it gets dealt with at all.
Many mattresses manufactured over the last two decades may actually be bad for you. The western way to health has been typically to "target and destroy" the "bad". This sometimes mean choosing the lesser of two evils. Many old mattress contains copious amounts of chemicals to produce key features such as "Anti-Static" and "Anti-Dust Mite".