2 inches: a lighter adjustment
A starting point when you want added cushioning while preserving more of the underlying mattress feel. It also adds less height to your bed and may fit your existing sheets more easily.
Alexa Sleep · Comparison & buying guides
Start with the comfort change you need. Then compare materials, thickness and your whole sleep setup to find a topper that makes sense for you.
Find your starting pointBy Alexa Sleep · Updated September 10, 2026
The best cooling mattress topper for you depends on your starting mattress, preferred cushioning and bedding. A topper adds a comfort layer; it does not replace the support system underneath.
| What to compare | What to consider | What to check first |
|---|---|---|
| My mattress feels a little too firm | A thinner comfort layer for a smaller change | The mattress is flat and still supports you comfortably |
| I want more cushioning | A thicker memory foam layer for a more noticeable change | You like a deeper contouring sensation rather than a firmer surface |
| My bed feels hot | Materials, room conditions and breathable bedding together | Your protector and sheets are not working against your comfort goal |
| My mattress has a dip | Assess the mattress and foundation before buying a topper | A topper will follow the shape underneath rather than repair a sag |
| I need a special fit | Measure the actual sleep surface | Length and width match; RV and short-queen dimensions may differ |
Alexa Sleep’s Cooling Gel Memory Foam Topper comes in two thicknesses. Make this choice around how much you want to change the surface feel.
A starting point when you want added cushioning while preserving more of the underlying mattress feel. It also adds less height to your bed and may fit your existing sheets more easily.
A starting point when you want a more noticeable, plush change. Allow for the added height and check that a deeper contouring feel matches your preference.
Foam density is commonly stated in pounds per cubic foot (lb/ft³). It describes the mass of a given volume of foam. A higher density does not automatically mean a firmer feel.
Indentation Force Deflection (IFD), also called ILD, describes the force needed to compress foam under specified test conditions. Higher values indicate more resistance when the foam and test conditions are comparable.
A topper’s total height does not tell you how much memory foam it contains. For example, 1.5 inches of gel memory foam over 1.5 inches of base foam adds up to a 3-inch topper. That construction will not necessarily feel like 3 inches of memory foam alone.
Alexa Sleep’s 3-inch Zoned Mattress Topper uses this two-layer construction, with a 28 IFD head zone, a firmer 50 IFD middle zone and a 28 IFD foot zone in its base. See the product page for its construction details and current options.
In a zoned base, the middle can use firmer foam than the head and foot sections. Check which layer is zoned and how the zones line up with you. Component IFD numbers are not a universal comfort rating for the finished topper, and zoning cannot repair a sagging mattress.
Terminology reference: Polyurethane Foam Association: foam performance. Compare IFD figures only with the test method and specimen details in mind.
In this product, gel is incorporated into memory foam. It remains a contouring foam topper rather than an actively refrigerated sleep surface. It can change the feel of your mattress, but the material name alone does not promise a fixed temperature or a cold surface all night.
If you are comparing “gel” with “memory foam,” first check whether both options are actually memory foam. Our gel vs memory foam mattress topper comparison explains the terminology and the practical questions to ask.
Check the full stack above and below the topper: mattress condition, topper, protector, sheets and blankets. In a warm room, changing a topper alone may not address every reason you feel hot.
See current sizes and thicknesses for the Alexa Sleep Cooling Gel Mattress Topper.
No. Density measures foam mass per volume, while IFD measures resistance to compression under specified conditions. Compare both, along with each layer’s thickness and the construction of the finished topper.
There is no single best option for every sleeper. Start with a supportive mattress, choose the amount of cushioning you want, and compare dimensions, materials and return terms. This guide has not ranked products using laboratory cooling tests.
It may change surface comfort, but adding another foam layer does not guarantee cooler sleep. Also review the room temperature, protector, sheets and blankets. If the mattress is uncomfortable because it is sagging, a topper is not a repair.
Sleep position is only one factor. The amount of give you want and the firmness of the mattress below matter too. Consider 2 inches for a smaller comfort adjustment or 3 inches for deeper cushioning, then check the purchase terms.
Check the mattress dimensions, bunk clearances, fitted-sheet depth and any restrictions from the bed or RV manufacturer. Do not assume a standard queen and a short queen are the same size.
No. If the mattress or foundation is sagging or damaged, assess that support problem first. A comfort layer generally follows the surface beneath it.
Explore the 2-inch and 3-inch options, current dimensions and pricing.
Shop Cooling Gel TopperExplore all comparisons