Mlily Premier Mattress Topper Review
A foam topper from a brand better known for springs, and the thing that decides whether you should buy any topper is a measurement you can take in thirty seconds.
I earn a commission if you buy through some links on this page. It never changes what I recommend, and I publish negative verdicts on brands I earn from. Editorial independence.
Verdict
A foam topper from a brand better known for springs, and the thing that decides whether you should buy any topper is a measurement you can take in thirty seconds. Most people buying one have not taken it.
Buy it if
Your mattress is structurally sound, too firm, and you do not already sleep hot.
Avoid it if
Your mattress has dipped. A topper will follow the dip and the money is gone.
See the current Mlily offer
Mlily sells direct and through UK retailers. Compare both, because prices differ.
No code needed. The discount is applied automatically at checkout. Opening the site in a new tab.
Mlily on Amazon UK
Widely listed here, and the price often differs from direct.
No code needed. Prices on Amazon change frequently, so check the seller and the returns terms before you buy. Opening in a new tab.
| Specification | Detail |
|---|---|
| Type | Foam mattress topper |
| What it changes | Surface firmness and feel |
| What it does not change | Support, or a sagging mattress |
| The check first | Lay a straight edge across the mattress and measure the deepest gap |
| Heat | Foam adds insulation. It will make a warm sleeper warmer. |
The scores
Does its job well. The job is narrower than most buyers assume.
Reasonable at Mlily's pricing.
Takes the edge off a firm mattress without remaking it.
Adding foam to a bed makes it warmer, not cooler.
A topper does not provide support. Scoring it otherwise would mislead.
Expect several years before it compresses into the mattress beneath.
Varies by seller. Check before ordering.
The 25 millimetre rule
Measure before you buy anything
A topper changes firmness. It does not change support.
If your mattress has a dip of more than about 25 millimetres, a topper will follow that dip within a few weeks and you will have spent the money for nothing. Lay a straight edge across the mattress and measure the gap at its deepest point.
Toppers are for a structurally sound mattress that is simply too firm, or for changing the surface feel. They are not a repair, and using one to delay replacing a failed mattress costs you the money that would have contributed to the replacement.
Choose a topper on heat, not thickness
| Type | Softens | Effect on heat |
|---|---|---|
| Memory foam | Strongly | Makes you warmer |
| Micro-spring or foam cylinder | Moderately | Neutral to cooling |
| Latex | Moderately, with bounce | Neutral |
| Wool | Mildly | Regulates moisture |
Softening is the easy part and every topper does it. The heat consequence is what people get wrong.
A foam topper on a hybrid is the worst case: it sits above the springs and cuts you off from the airflow that was doing the cooling. If you bought a hybrid partly for its temperature, do not put foam on top of it.
A correction worth making
Commonly repeated, and wrong
Mattress toppers are compared on thickness and firmness, as though they all do the same job with more or less of it. The material matters far more than the depth. A memory foam topper adds insulation and makes a warm sleeper warmer, and on a hybrid it sits above the springs and cuts the sleeper off from the airflow that was doing the cooling. Choosing on thickness is how people end up sleeping softer and considerably hotter.
Should you buy it?
Yes if your mattress is sound, too firm, and you do not already sleep hot. Measure for a dip first.
If you sleep warm, buy wool or a micro-spring topper instead. If the mattress has dipped, put the money toward a replacement.
Questions people ask
Will a topper fix a sagging mattress?
No. A topper conforms to the surface beneath it, so a dip of more than about 25 millimetres reappears through it within weeks. Lay a straight edge across the mattress and measure the gap at its deepest point first.
Should I put a foam topper on a hybrid mattress?
Not if you bought the hybrid partly for its temperature. A foam topper sits above the springs and cuts you off from the airflow that was doing the cooling. Wool or a micro-spring topper softens without that penalty.