FoamRush 4-Inch Short Queen RV Mattress Review
The FoamRush 4-inch short queen is a thin, medium-firm gel foam mattress for low-clearance RV beds. It fits pop-up, dinette and guest beds better than it fits side sleepers who want deep cushioning.
On this page (17 sections)
- What you get in the box
- Setting up the foam in your RV
- How 4 inches fits an RV bed
- Foam specs: density, ILD and firmness
- Who the FoamRush short queen RV mattress suits best
- How it suits different sleep positions
- Lift beds and weight
- Who should skip it
- What buyers often mention
- Heat, airflow and the gel layer
- Trimming and fitting the foam
- Care, moisture and the cover
- What to check before you order
- Before you buy: measure and check returns
- How it compares with the other short queen picks
- Our score and the main pros and cons
- Verdict: thin bed or deeper foam
At 4 inches, it's half the height of a typical 8-inch RV mattress, which is exactly why it fits where thicker beds won't. It ships as bare foam with no cover, so plan on a protector or a fitted sheet.
What you get in the box
FoamRush sells the foam only, with no cover, so plan on buying a fitted or waterproof protector of your own. Open the box right away and unroll the foam so it can relax.
Keep sharp tools away from the shipping box, since they can cut into the foam. Open it with your hands or a blunt tool.
Setting up the foam in your RV
Unroll the foam on a clean, flat platform before you make the bed. Judge the feel after the foam has settled, not straight out of the box.
Keep the foam out of direct sun and damp corners while it settles. A standard fitted sheet usually fits a 4-inch layer, but a deep-pocket sheet holds better on a bed that moves when you do.
How 4 inches fits an RV bed
The foam is 74 inches long, 60 inches wide and 4 inches thick. That matches the common short queen footprint in our short queen size guide, but some RV platforms run 75 inches, so check yours.
A 4-inch layer adds much less height than a typical 8-inch mattress, which matters under cabinets and near a slide-out. Our RV mattress sizes guide has the full size chart for every common RV bed.
| Mattress | Size | Thickness | Firmness |
|---|---|---|---|
| FoamRush 4-inch gel foam (this review) | 74 x 60 in | 4 in | Medium firm |
| FoamRush 4-inch high density | 74 x 60 in | 4 in | Firm |
| Zinus Ultima 8-inch | 74 x 60 in | 8 in | Medium |
Foam specs: density, ILD and firmness
The foam has a density of 1.8 and a compression rating of 44 ILD. ILD, or indentation load deflection, is the force in pounds needed to press a foam sample down by 25 percent.
FoamRush calls it medium firm, but 44 ILD leans toward the firmer side for mattress foam. Don't expect a soft top layer from this foam.
FoamRush's foam is CertiPUR-US certified. You can read what that independent program covers at certipur.us.
Who the FoamRush short queen RV mattress suits best
This foam makes the most sense where bed height is the main problem. Pop-up beds, dinette conversions and guest bunks with little headroom are the clearest fit.
A pop-up bed has a height limit when the camper folds closed, and a thin layer is easier to fit into that space. Check the bed ends with the roof down before you order.
Dinette conversions often sit on a bench or cushion height that a deep mattress pushes out of line. A 4-inch layer keeps the sleeping surface lower, so the converted bed sits closer to the height of the seats.
Guest bunks and loft beds usually have less headroom than a main bedroom, which makes a thin layer the practical choice. Back sleepers who want a firm surface may also find the thin, supportive feel suits them, since there is little soft foam between you and the platform.
How it suits different sleep positions
A firm, even surface is the usual starting point for back sleepers, and a thin firm layer can keep the body close to that surface. Stomach sleepers generally want a firm surface that keeps the hips from sinking, so this foam may suit them better than a plush top.
Side sleepers need more give at the shoulder and hip, which a 4-inch firm layer may not provide. A thicker, softer top is the better starting point for that group, so look at the 8-inch option below before you decide.
Lift beds and weight
FoamRush doesn't publish a weight, so confirm it with the brand if your bed lifts on struts. Thin foam is generally lighter than a deep layer, but get the number before you load a lift.
Include the protector and sheets in your weight estimate, since they add to what the lift carries. A lift bed should always be checked against its own rating before you load it.
Who should skip it
Side sleepers who want deep contouring are better off with a thicker foam, such as the 8-inch Zinus option covered below. Heavier sleepers on a soft or sagging platform may also find that a 4-inch layer bottoms out.
For thicker foam, see our best memory foam RV mattresses roundup.
If you have ongoing back, hip or shoulder pain, ask a doctor which setup suits you before you change anything.
What buyers often mention
Owners of thin foam replacements often mention two things: a good cover matters, and an uneven platform makes thin foam feel lumpy. Buyers who cut foam also say a long, sharp blade gives the cleanest edge.
Buyers who compare thin foam with a deep mattress often say the thin layer is easier to carry through a narrow RV door. In a tight space, the size and height matter more than the feel, so check those first.
Heat, airflow and the gel layer
Gel is added to memory foam to help it feel cooler, and FoamRush says the gel infusion helps the foam shed body heat. A thinner layer holds less heat than a deep one, but a closed camper still runs warm at night.
Airflow under the bed matters as much as the foam, so treat the gel as a helpful extra, not a fix for a warm room. A roof vent or a small fan running overnight does more for a closed camper than any single layer can.
Trimming and fitting the foam
The foam cuts with most slicing tools, so you can trim the edges, glue pieces into a wider layer or stack layers for extra thickness. That flexibility helps when an RV bed has a corner, a notch or a cut-out that a standard mattress does not match.
Mark the cut line on the foam first, then cut in short, even passes with a long, straight blade. Trim a little at a time, because you can always take more off but you cannot put it back.
Gluing two pieces together can make a wider layer, but the seam may show under a sheet and can feel different from the rest of the bed. Test the fit with the protector and sheet on before you commit to the glue.
Care, moisture and the cover
The foam is not water resistant, so a waterproof protector is a practical add-on for an RV bed. Moisture from sleepers can collect under the foam on a solid platform, so venting matters as much as the cover.
Our guide to preventing mold under an RV mattress covers the steps that help most. A protector that bunches or slides can leave gaps, so pick one that sits flat on the foam.
What to check before you order
Run through this short checklist before you click buy, and the common surprises stay off the road.
- Platform length and width, measured end to end, against 74 by 60 inches
- Height from the platform to the ceiling, cabinets and any slide-out
- Bed frame or base height added to the 4-inch foam, for the total sleep height
- A protector ready to order, since the cover is not included
- The return terms, including the 50% restocking fee that may apply
Before you buy: measure and check returns
Measure the platform, not the old mattress, and note the height from the platform to the ceiling, cabinets and any slide-out. Our how to measure an RV mattress guide walks through each step.
Add the height of your bed frame or base to the 4-inch foam to get the total sleep height.
Returns on the FoamRush short queen mattress
A 50% restocking fee may apply on returns, so be sure of the size before you open the box.
Once you cut the foam to fit, plan to keep it. A trimmed layer is hard to return, so treat trimming as a final step.
How it compares with the other short queen picks
FoamRush sells a high-density version in the same size and thickness, but it's a firm foam rather than a medium-firm one. Choose that version when you want a firmer feel on the same footprint.
If you have room for 8 inches and want more depth, the Zinus Ultima is the step up. Our Zinus 8 inch short queen review covers it in detail.
For a broader view of thickness choices, read how thick an RV mattress should be. Our best pop-up camper mattresses picks also include thin options for folding beds.
Our score and the main pros and cons
We compared specs, materials and what owners report. Our score weighs specs, features and buyer feedback against what you're shopping for.
This foam scores 8.2 because its size and profile match a specific RV need. It trails the thicker picks because it suits fewer sleep styles.
FoamRush 4-Inch Short Queen Gel Foam Mattress
- 74 by 60 inch short queen footprint
- 4-inch gel memory foam
- CertiPUR-US certified foam
- Cover not included
The thin layer to look at when cabinets, a slide-out or a pop-up roof limit your bed height. It is a 4-inch short queen with no cover included.
Pros
- Thin 4-inch profile for low-clearance beds
- Gel infusion that FoamRush says helps shed body heat
- Can be cut and trimmed to fit an odd corner
- Made in USA
Cons
- No cover included, so you need a protector
- Not water resistant
- A 50% restocking fee may apply on returns
Verdict: thin bed or deeper foam
Pick the FoamRush 4-inch short queen if your bed has little headroom, your platform is firm and you can buy a protector. Pick the thicker Zinus if you want more depth and have the clearance, and skip this foam if you sleep on your side and want a plush top.
Before you order, confirm the length against your own bed, not a chart, and keep the return terms in mind. If the size checks out and the height works, the thin layer is a sensible, low-profile upgrade for a tight RV.
Frequently asked questions
Is the FoamRush 4-inch short queen the right size for an RV?
It measures 74 by 60 inches, which matches the common short queen footprint used in many RVs and campers. Some RV beds run 75 inches instead, so measure your platform length and width end to end before you order to avoid a return.
Does the FoamRush foam come with a cover?
No, FoamRush sells the foam only, with no cover. Buy a fitted or waterproof protector sized to 74 by 60 inches so it sits flat on the foam and stays clean on a solid platform, and check the fit before you order.
How firm is the FoamRush 4-inch short queen?
FoamRush calls it medium firm, but the foam has a density of 1.8 and a compression of 44 ILD. That compression number leans firm for mattress foam, so expect a firmer feel than the name suggests and weigh the number as much as the label.
How long should the FoamRush foam last?
FoamRush designs the firm foam to last about 7 to 12 years. Wear depends on your weight, how often you sleep on it, the platform underneath and how well you keep moisture off the foam, so treat that figure as an estimate, not a promise.
