IKEA VIMSIG Foam Mattress for Extendable Bed Reviews (2026)

Yes—if you already own an IKEA extendable bed and want a mattress that can follow the frame through all three lengths. VIMSIG's reversible foam gives children a useful choice between medium-firm and firmer surfaces, and the removable cover is easy to wash after spills. Those practical features matter more than luxury comfort here.

The trade-off is the thin build. VIMSIG supports a lighter back or combination sleeper reasonably well, but a child who spends most of the night on their side may feel more pressure at the shoulders and hips. The perimeter also compresses quickly when used as a seat. Buy it for fit, convenience, and simple care—not for plushness or adult-level support.

Who it's for

• Lighter children using an IKEA extendable bed through several growth stages

• Back and combination sleepers who prefer a flatter, firmer surface

• Parents who value a removable, machine-washable cover

Who should skip it

• Older or heavier children who need more cushioning and a stronger perimeter

• Adults looking for a mattress for regular nightly use

• Dedicated side sleepers who need deeper pressure relief

We set VIMSIG on an IKEA extendable frame at each of its three lengths. At every setup, we checked back and side alignment, shoulder and hip pressure, temperature change, motion transfer, recovery after compression, and stability at the perimeter. We also removed and refitted the cover and repeatedly attached the extension pieces to see how the seams behaved during normal setup and use.

VIMSIG measured the advertised 3 7/8 inches thick once it was fully settled. At the shortest length, the mattress felt compact and evenly supported. Adding both extensions did not change the feel of the main section, but the seams were easier to notice when a tester lay diagonally or moved a knee across a joint.

The two surfaces felt meaningfully different. We rated the egg-shaped side about 7/10 for firmness and the smooth side about 8/10. The textured side allowed slightly more give at the shoulders, while the smooth side kept a back sleeper flatter and made reading in bed feel steadier. Neither side provided the contouring of a deeper foam mattress.

A 44-pound load compressed the center by about 0.9 inch but sank roughly 1.6 inches when positioned two inches from the edge. That gap matches what we felt while sitting and scooting along the perimeter: the middle held up adequately, while the edge folded down quickly. Heat buildup was moderate rather than severe. The surface rose from 69.8°F to 76.1°F after 30 minutes of contact and cooled to within 2°F of its starting temperature 10 minutes after the load was removed. The thin foam also settled movement quickly, which explains the mattress's strong motion-isolation score.

What we liked

• The medium-firm and firmer surfaces feel distinct enough to be useful

• The removable cover simplifies cleanup after spills and accidents

• Two extension pieces let the mattress match the frame as a child grows

Who it is best for

• Lighter children who sleep on their back or change positions often

• Small bedrooms where an extendable bed saves useful floor space

• Families that want one mattress to fit all three frame lengths

Where it falls short

• Deep shoulder and hip cushioning for side sleepers

• Edge support for sitting, dressing, or frequent perimeter use

• Comfort for larger children, teenagers, and adults

• Price: $199.99 at the time of review; local price and stock may vary

• Type: Three-piece foam mattress for IKEA extendable beds

• Dimensions: 38 1/4 inches wide; 47 1/4 inches, 61 inches, or 74 3/4 inches long

• Thickness: 3 7/8 inches

• Feel: Egg-shaped side is medium-firm; smooth side is firmer

• Comfort material: Polyurethane foam, 1.7 lb/cu. ft.

• Cover: Removable outer cover; machine wash warm, inside out, with the zipper closed

• Child-safe zipper: The pull tab is removed; use a paper clip through the loop, then remove the clip

• Returns: IKEA lists 365 days for new, unopened products and 180 days for opened products with proof of purchase, subject to condition and exclusions

• Mattress exchange: One exchange within 90 days if the mattress meets IKEA's condition requirements

• Warranty: IKEA's mattress limited warranty excludes children's mattresses

Start with the bed frame when you choose a mattress. If you own an IKEA extendable bed and want one mattress to cover all three lengths, VIMSIG is the most balanced foam option in the range. Its 3 7/8-inch profile and two comfort surfaces offer more versatility than the thinner PLUTTEN without moving to a spring mattress.

Next, consider the sleeper. VIMSIG is best for a lighter child who sleeps on their back or changes positions. A dedicated side sleeper, a larger child, or anyone who often sits on the edge will benefit from the extra depth and stronger support of a thicker model. Standard Twin and Full mattresses are not direct replacements because they do not match the extendable frame at its shorter settings.

VIMSIG's specialized shape is both its advantage and its main limitation. It works across the three lengths of an IKEA extendable bed, but it is not a standard Twin or Full mattress. The shallow foam can feel hard at the shoulder and hip, the perimeter is weak for sitting, and the joints between sections become easier to feel at full length. The washable cover helps with everyday messes, but the children's-mattress category is excluded from IKEA's mattress limited warranty.

Why you might still choose VIMSIG

• It matches all three lengths of an IKEA extendable bed

• Its two surfaces provide more comfort choice than a single-feel foam model

• The removable, washable cover makes routine cleanup straightforward

Alternatives to consider

IKEA PLUTTEN is the direct budget alternative. It uses the same three lengths but is thinner at 3 1/8 inches, uses lower-density foam, and feels the same on both sides. Choose it to spend less; choose VIMSIG for a little more depth and a genuine choice of firmness.

IKEA INNERLIG is the closest step up in price and fit. Its 4 3/4-inch profile uses Bonnell springs in the main section, so it feels livelier and more substantial than VIMSIG. It is the better match for a child who needs more depth but still requires the extendable format.

Helix Kids is an 8-inch hybrid offered in standard Twin and Full sizes, with a firmer side for younger children and a softer side for older children. Its coils and reinforced edges provide more structure than VIMSIG, but it costs considerably more and only makes sense after moving to a standard-size frame.

Saatva Youth is a premium dual-sided innerspring for ages 3 to 12. Its age-specific surfaces, center-third support, and full-depth build make it a long-term standard-bed option, but its price is several times higher than VIMSIG's and it does not serve the same space-saving frame.

Nectar Kids is an 8-inch, dual-sided foam mattress with a removable, machine-washable cover. It offers more cushioning depth while retaining the quiet movement control of foam. Consider it for a standard Twin or Full bed; stay with VIMSIG when adjustable length is the priority.

• Add a waterproof protector before the first night

• Let your child use one side for several nights before deciding whether to flip it

• Align the extension pieces carefully so every seam lies flat

• Use a fitted sheet sized for the frame's current length

• Wash the outer cover inside out with the zipper closed

• Rotate the mattress end to end occasionally to spread wear

• Keep it on a firm, supportive base

• If shoulder pressure persists, move to a deeper mattress rather than masking the problem with frequent side changes

• Confirm current price, stock, return terms, and exchange conditions before ordering