Search for bedding and you will meet three things that photograph almost identically: a topper, a pad, and a protector. They sit in the same place on the bed and cost wildly different amounts, which makes choosing harder than it should be.
A topper changes how the bed feels
A topper is thick. It adds a genuine layer of loft on top of the mattress, usually a quilted pillow top with real fill inside, and it is the biggest change you can make to a bed without replacing the mattress. If your mattress is too firm, or has flattened in the middle, a topper is the thing that addresses it.
Because it is thick, fit matters. Look at the pocket depth rather than just the size name: a topper with a deep pocket and an elasticated skirt will stay put on a tall mattress, and one without will slide.
A pad sits thinner and closer
A pad adds a modest quilted layer and a different surface to sleep on. It will not rescue a mattress that has lost its shape, but it changes the feel underneath you and adds a washable layer between you and the mattress. If your complaint is about texture or temperature rather than support, a pad is usually enough, and it costs considerably less.
A protector is about the mattress, not you
A protector exists to keep the mattress clean. It is thin, it is meant to be washed often, and it should be almost undetectable once the sheet is on. If you are not trying to change how the bed feels at all, this is the one you want.
Choosing quickly
- The mattress sags or feels too firm — topper
- You sleep hot, or dislike the surface — pad
- You want the mattress to stay clean — protector
One thing worth checking on any of them: the pocket depth against your actual mattress. It is the most common reason a bedding order goes back.