They may already have a cover or pad on the mattress or pillow and want to know if it will do the trick. I don’t blame them for asking. I wouldn’t want to buy a new mattress cover if the mattress cover I already owned would do the trick.
The most tightly woven microweave mattress covers are made from polyester fibers. That is because polyester is a strong yarn that can be woven very tightly without breaking. To get allergen protection, you want a mean (average) pore size of at least 8 microns. the good microweave mattress covers are made with fabrics that have a 5 micron pore size and the really really good ones have a pore size of 4 microns. Of course if you don’t like the idea of a mattress cover made from polyester and want the coolness of cotton, then you will have to sacrifice some pore size..
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