Does a Mattress Protector Go Over or Under a Topper?

Most people put a fitted protector over the topper and mattress together when they want to protect both. The key is whether it can fit the total depth.

Over the topper

Protects both topper and mattress from spills. Measure the combined stack first.

Under the topper

Protects the mattress but leaves the topper exposed. This can make sense when the topper has its own washable cover.

Check tension

A tight fitted protector over a thick topper can change feel or pull corners upward.

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