Mattress toppers and pads: thickness, density, and what a topper can fix

A topper is two to four inches of foam, latex or fibre laid over a mattress. It changes how the surface feels and does nothing about what is underneath, and the specification sheet is thickness, material and density — the third of which decides whether it is still doing anything a year on.

What the category is

Memory foam toppers in 2, 3 and 4 inches, often gel-infused or ventilated; latex toppers in the same thicknesses, Dunlop or Talalay, firmer and springier; fibre and down-alternative toppers that add softness and nothing structural; mattress pads, which are thin quilted layers mostly for protection. A topper is not a protector and a pad is barely a topper.

How to read the spec sheet

Thickness: 2 inches changes the feel; 3 inches changes the mattress; 4 inches is a new sleeping surface and will need deep-pocket sheets. Fibre toppers are quoted by fill weight in grams per square metre instead.

Density on foam: 3 pounds per cubic foot and up holds its shape; 2 pounds softens within a year. Most toppers do not state it, and a review says so.

Firmness or ILD on latex: 20 to 24 is soft, 28 to 32 medium, 36 and up firm, and the figure is more consistent than a foam’s marketing word.

Cooling: gel, copper, ventilation holes, phase-change covers. These are claims about heat that a specification cannot verify; a review reports them and says which have a mechanism behind them.

Cover and straps: a removable washable cover and corner straps decide whether the topper stays put and stays clean. Both are on the sheet or not.

Certifications: CertiPUR-US on foam, GOLS on organic latex, OEKO-TEX on covers.

Who it suits

Anyone whose mattress is too firm but still flat; a guest bed or a dorm mattress that needs softening; a latex topper for a side sleeper who wants pressure relief without sinking.

Who should skip it

Anyone whose mattress sags, dips or has lost support. A topper follows the shape of what is under it, and a sagging bed needs a new mattress, not a layer on top.

Where to start

Or answer four questions and let the mattress finder narrow the 124 to the ones that fit how you sleep.

Six of the 124 mattress toppers & pads mattresses and the things you sleep on reviewed on this site, one per model, across manufacturers. Every review is written from the manufacturer’s published specifications — how, and what that leaves out.

• ZINUS 2 Inch Full Swirl Gel Cooling Memory Foam Mattress Topper
• Serta ThermaGel Cooling Mattress Topper
• Latex for Less 3″ Medium Mattress Topper
• 2-Inch Cot Mattress Topper
• 2-Inch Natural Latex Mattress Topper
• 3 Inch Egg Crate Twin Memory Foam Mattress Topper

All 124 mattress toppers & pads mattress reviews

Newest first. Consumables, accessories and parts that were once filed here are excluded.