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Yes
Yes.
Yes
Yes, you can use an electric blanket with a memory foam mattress topper. You might actually enjoy the feel of the mattress more when using an electric blanket because they often times feel different depending on the tempurature.
no
Most foam mattress toppers have a beige or white colored covering. The foam on the inside of the mattress topper may be any color, grey, white, blue etc.
which material used in mattress
A cotton mattress is cotton. cotton is a plant.
While foam mattresses need not be turned like conventional mattresses, the first word in foam mattress maintenance is the same as it would be for the maintenance of a standard mattress. That word is protection. Covering your foam mattress with a quilted mattress pad cover that is removable and washable will have the biggest impact on preserving both the life and freshness of your foam mattress. Always make certain that the mattress cover is completely dry before replacing it on your foam mattress, and vacuum the foam mattress itself once a month.
No
Typically 24 hours is ideal for the foam mattress to regain its natural form.
Yes, but it will sleep hot! Having a pad over a good memory foam mattress defeats the purpose of buying a good mattress set. You can use a mattress protector that has been specially made to dissipate the heat see your local mattress store for the paper thin protector.