Is the Sealy Flex really waterproof?

Yes. It has a waterproof backing under the knit surface that blocks spills and stains from reaching the mattress.

Will it fit a deep mattress?

It is listed with a 15-inch thickness, so it fits most standard and pillow-top mattresses up to about 15 inches deep.

Machine wash it and tumble dry low. Avoid bleach and high heat, which can damage the waterproof layer.

It is thin, so most sleepers notice little difference. The polyester knit adds some warmth compared with a bare mattress.

Full, Queen and King, sold one per pack in white.

The best new price is $31.90 at Macy's as of November 7, 2026. Watch for bedding sales at Macy's and the other 3 stores that carry it.

At Macy's, for $31.90, 27% under what the other stores charge, as of our latest check.

Rated 4.3 out of 5 from 101 ratings.

4 stores we checked sell it, including Target, eBay, Macy's, Kohl's.

$31.90at Macy'sObserved at 7:10 AM

27% under what the other stores charge

Compared across 4 stores. Prices are checked against each store and labelled with when.