A mattress pad protects your mattress while adding a soft layer of comfortable padding for you to sleep on. The extra thick type of pads are supposed to provide even more comfort, but this really depends on individual tastes. For some people, softer does not necessarily mean better. If your mattress is already fairly thick and you add an extra-thick pad to it, make sure that your sheets can fit around both. You may end up having to buy extra deep contour sheets.
Extra-thick mattress pad:
Extra-thick mattress pad pictured: Hospitology Heavenly Microfiber Goose Down Alternative Overstuffed Mattress Pad/Topper, 72-Inch by 84-Inch, California King
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