These days, more and more people buy a memory foam mattress to replace their old innerspring because it maps contour of the body and provides enough support. The most distinguishing feature is it absorbs our body weight and makes we feel like floating in a cloud. Premium memory foam is temperature sensitive. When it senses our body heat, particles on the surface begin to soften and share pressure evenly. In this way, it keeps the circulation of the blood and doesn’t cause numb arms. Memory foam conforms to the body shape, provides a proper spine alignment to give target support where you need it. That’s the way it relieves pressure and gives us floating feel.
Memory foam mattress has obvious drawbacks. It will have a body shape indentation where the sleeper usually sleeps. Therefore, owners should turn the mattress around at regular intervals to maintain its shape and extend its lifespan. Heat dissipation is a big problem for memory foam. Many people feel over-warm even hot on the mattress because it dissipates much less heat than it absorbs. Memory foam mattresses are made from polyurethane with additional chemicals, which causes skin irritation and gives off strong odor.
Generally, quality memory foam performs better in providing comfortable sleep with minimal drawbacks. So, it’s important to determine whether it’s quality foam. Foam quality depends primarily on manufacturing methods, density, resilience time, temperature sensitivity, etc. When we go to stores, we can find a quality foam mattress easily.
#1 manufacturing methods
There are two primary foam manufacturing methods including cutting and moulding. The cutting method is to cut large foam into a small piece for mattress use; the moulding is more complicated than the cutting method involving foaming, vacummizing, etc. The foam mattress produced by cutting method has a bad resilience. It doesn’t recover its original shape where people often sleep. The foam by cutting has uneven density distribution. This method does not, and cannot possibly apply the ergonomic theory in the manufacturing process. Therefore, memory foam mattress produced by cutting is much cheaper. Ones by moulding cost more because of its complicated process.
The density is the basic parameter of memory foam. Mattresses of the same density may vary wildly as they may use different formula, material and manufacturing process. Note high quality memory foam is high density, otherwise it may be not true. Generally, density of premium foam mattress is over 5lb and mediate or low end is less than 4lb. We can judge the density based on size and weight of mattress. That being said the heavier one is higher density when mattresses are of the same size.
#3 recovery time
A misunderstanding exists in recovery time that is the time longer the foam better. Actually, the time within 3-5 seconds is appropriate. If shorter, the mattress can’t provide resilience; if longer, it doesn’t have support for sleeper. Most quality foams are restricted within that range, which provide both just right comfort and support.
#4 hand touch
When you stroke the good quality foam, you can feel it very comfortable and soft. On the contrary, you will feel stiff and rigid. High-end memory foam is very sensitive to temperature and it becomes firmer or softer as the temperature changes. You can see the hand print as advertised by putting one hand on it without pressing; no temperature sensitive mattress shows handprint only under a little more push.