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Queen Size Memory Foam Mattress Toppers

A queen bed measures 60″ wide by 80″ long — Canada's most popular size, so it gets our deepest selection in every accessory. Everything here is cut to fit a standard queen mattress exactly, with split options available where one piece won't clear a tight stairway or hallway. If you're unsure of your size, measure the mattress rather than the frame: queen accessories fit 60″ × 80″.

A mattress topper is a removable comfort layer that sits on top of your mattress and under the fitted sheet, changing how the surface feels without changing the support beneath it. National Mattress carries the MLILY Sierra, a 2.5 inch Cool Comfort gel memory foam topper in a Plush feel, aimed at sleepers whose mattress reads firmer at the shoulders and hips than they want. A topper is the right tool when the surface feel is wrong but the mattress underneath is still flat and supportive. It is the wrong tool once a mattress has lost its support, because adding softness over a dip deepens the dip rather than fixing it.

Queen Size Mattress Toppers
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Queen
  • MLILY® Sierra 2.5" Gel Memory Foam Topper - 1 MLILY® Sierra 2.5" Gel Memory Foam Topper brand icon
    • 2.5″ Cool-Gel Memory Foam
    • Plush Comfort Layer
    • Removable Double Jacquard Cover
    • Machine Washable
    • 5 Year Warranty
    Queen In stock for fast delivery $329
    Compare at $699
    Online availability icon In-Stock Only 4 left!
    In-Store availability icon On Display:
    Free delivery availability icon Free delivery to M5H 2N1 as soon as Tomorrow, Sep 8
    Pickup available icon Only Pickup available to
    M5H 2N1

1 Item

How to Choose a Mattress Topper

A topper solves exactly one problem: the feel of the sleeping surface. Lay a plush gel memory foam layer over a mattress that is flat and well supported but simply too firm, and you gain contouring at the shoulders and hips that the mattress itself does not offer. What a topper cannot do is add support. Support comes from the coil unit or the foam core, and no layer resting on top can restore either one. If you can see or feel a dip where you sleep, a soft topper follows that dip and deepens the sense of rolling into it. The same logic rules out using a topper to firm up a mattress that has gone too soft.

Heat is the standing complaint about memory foam, and gel does not settle that complaint so much as postpone it. Plain viscoelastic foam is dense and closes around you, so warmth has nowhere to go. A gel infusion raises the thermal mass of the foam, so the surface takes longer to reach body temperature, and once it gets there it behaves much like the foam around it. Airflow, an open cell surface and the sheet over the top do the sustained work. Thickness is the next decision, and the topper on this page is a single 2.5 inch layer: enough to change how the shoulders and hips settle, shallow enough to disappear under most fitted sheets. Measure the mattress and the topper together before you buy sheets, and check that it stays put, since a bare foam slab on a slick quilted panel migrates unless the fitted sheet holds it down.

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Gel Memory Foam and Heat

Dense foam holds warmth. A gel infusion takes longer to reach body temperature, so it delays the warm-up rather than preventing it; airflow and the sheet over the top do the sustained work.

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Thickness and Sheet Fit

The Sierra is a single 2.5 inch layer, enough to change how the surface gives without lifting the bed much. Add it to your mattress height before you check a fitted sheet pocket.

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What a Topper Fixes

Surface feel, and only surface feel. A too firm mattress that is otherwise flat and supportive is the case where a topper genuinely earns its place.

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When You Need a Mattress

A visible dip, a collapsing edge, or waking sore on a bed that used to be fine are all support problems, and softness laid on top corrects none of them. That is the point where a topper stops being the answer.

Frequently Asked Questions About Mattress Toppers

What does a mattress topper actually do?
A topper is a removable comfort layer that sits between your mattress and your fitted sheet. It changes how the surface feels, softening a firm mattress and adding contouring at the shoulders and hips. It does not change the support underneath, so it cannot make a mattress hold your spine differently. Think of it as adjusting the top inch or two of feel, not rebuilding the bed.
Will a memory foam topper make me sleep hot?
Plain memory foam does trap heat, because it is dense and wraps closely around you so warm air cannot escape. A gel infusion takes longer to reach body temperature, which delays the warm-up rather than solving it, and an open cell surface lets some air move. Airflow does the sustained work, so a breathable cotton sheet over the top helps more than most people expect.
How thick should a mattress topper be?
Thick enough to change the feel, thin enough that you still read the support underneath. The topper here is 2.5 inches, which takes the edge off a firm mattress and usually disappears under a standard fitted sheet. Thicker is not automatically better: the more foam you lay on top, the less of the coil unit or foam core you actually feel, and the more likely you are to need a deep pocket sheet.
Will my fitted sheet still fit with a topper on the bed?
Only if the pocket is deep enough. Measure your mattress from the top seam to the bottom seam, add the topper thickness, then compare that total against the pocket depth the sheet states. A standard sheet handles most mattresses up to roughly twelve inches, so a tall mattress plus a thick topper usually calls for deep pocket sheets to stay on the corners.
Can a topper fix a sagging mattress?
No, and it often makes the problem more obvious. Sagging is a support failure in the coil unit or the foam core, and a soft layer laid over it simply follows the contour of the dip. You end up in the same low spot with less feedback from underneath. Once a mattress carries a body impression you can see or feel, replacing it is the real fix.
Can I use a topper to make a soft mattress firmer?
It rarely works. A firm layer over a soft mattress still sinks with the mattress, so you get a hard surface travelling down into a soft base, which tends to feel worse than either did alone. Firmness has to come from the support core. If your mattress is too soft for you, look at firmer mattresses rather than a corrective layer on top.

Not Sure If a Topper Will Fix It?

Our non-commissioned sleep experts can tell you whether you have a feel problem a topper solves or a support problem it will not.

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