The meaning of "line mattress and pillows if you are allergic to dust mites"

Question

I found the following sentence in this link and I'm having a hard time understanding the meaning of it.

"Line mattress and pillows if you are allergic to dust mites"

What does it mean to line a mattress or a pillow? I have found two possible definitions in this context for the verb "line", but I don't think either one of them is the "exact" definition in this case:

To fit a covering to the inside surface of.
To cover the inner surface of.

(The inside or the inner surface of a matress or a pillow?)

Thank you!

Louisa Chan · Answer

To line a mattress and a pillow means to use a mattress protector and a pillow cover as the first layer followed by a top layer which is the bedsheet and the pillow case. You can google the images of a mattress cover and a pillow cover.

Answered by Louisa Chan on February 7, 2021

The meaning of "line mattress and pillows if you are allergic to dust mites"

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