Silentnight Airmax Topper Review
A hollowfibre topper with air mesh sides rather than foam, which is why it does not make a warm sleeper warmer. The mesh is a border, not a layer.
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Verdict
A hollowfibre topper with mesh side panels rather than a foam one, which makes it one of the few toppers that does not make a warm sleeper warmer. Almost every topper guide recommends memory foam, and for anyone who sleeps hot that is the wrong answer. Note what the mesh actually is, though, because it is not the spacer layer the name suggests.
Buy it if
Your mattress is sound but too firm, and you sleep warm enough that a foam topper would make things worse.
Avoid it if
Your mattress has dipped more than about 25 millimetres, or you want deep cushioning. Mesh softens less than foam.
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| Specification | Detail |
|---|---|
| Type | 3cm dual-layer hollowfibre topper with air mesh side panels |
| Where the mesh is | In the sides only. Silentnight says it is “specially constructed with air mesh sides which help air to move freely”. |
| Against foam | Hollowfibre insulates far less than memory foam, and the mesh border lets the air it displaces escape sideways |
| Price and cover | GBP 50 king, GBP 55 super king, with a 2 year warranty |
| What it does not change | Support, or a sagging mattress |
| Anchoring | Check for corner straps, or buy a deep fitted sheet for both layers |
The scores
One of the few toppers that does not undo the airflow of the mattress beneath it.
Fair. Cheaper than a micro-spring topper and cooler than a foam one.
Moderate. Mesh cushions less than foam, which is the honest trade.
The reason to buy. An open structure with air moving through it.
A topper does not provide support. Scoring it otherwise would mislead.
Check whether the cover removes. Mesh layers usually do not wash.
Silentnight's terms, from a manufacturer trading since 1946.
Where the mesh actually is
Start with what Silentnight actually publishes, because the Airmax name invites a guess and this page used to make it. The topper is “deeply filled with hollowfibre” in a “3cm Deep Dual Layer”, and it is “specially constructed with air mesh sides which help air to move freely around your body”. The mesh is a border around the edge. There is no spacer layer running under you.
That is a weaker arrangement than a true three-dimensional spacer fabric, which holds two textile faces apart with a forest of vertical fibres so that air moves through the layer you lie on. It is the construction used in rucksack backs and office chairs, and it is not what you are buying here.
What the Airmax does have is still the right idea for a warm sleeper, because the fill matters more than the border. Hollowfibre is loose, bulky and largely air, so it insulates far less than foam and the air it displaces as you settle can leave through the mesh sides. Compare that with foam, which has small closed cells and almost no air movement: a foam topper is an insulating layer between you and whatever airflow your mattress provides.
The trade is depth of cushioning. Three centimetres of hollowfibre softens the surface moderately. Foam softens it strongly. If you want to sink into a topper, this will disappoint you, and if you want a slightly kinder surface without the heat, it is the right choice at GBP 50 for a king.
Why topper guides get this wrong
| Type | Softens | Effect on heat |
|---|---|---|
| Memory foam | Strongly | Makes you warmer |
| Spacer mesh | Moderately | Neutral to cooling |
| 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, and it is why memory foam being the default recommendation causes so many disappointed buyers.
A foam topper on a hybrid is the worst case: it sits above the springs and cuts you off from the airflow that was the reason you bought the mattress.
Measure first, and plan how to anchor it
The 25 millimetre rule
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 weeks and the money is gone. Lay a straight edge across the mattress and measure the gap at its deepest point.
Then plan the anchoring, because every topper slides. Elastic corner straps if it has them, or a deep fitted sheet sized for the mattress plus the topper together. A 28 centimetre mattress with a 5 centimetre topper needs a 33 centimetre sheet.
A correction worth making
Commonly repeated, and wrong
Memory foam is the default recommendation in almost every mattress topper guide, and it is the wrong answer for anyone who sleeps warm. Memory foam responds to body heat by design and has small closed cells with almost no air movement, so adding a layer puts insulation between the sleeper and whatever airflow the mattress provides. On a hybrid it sits above the springs and cuts the sleeper off from the cooling that was the reason for buying it.
Should you buy it?
Yes if you sleep warm and want a kinder surface without the heat penalty. A spacer mesh softens less than foam and does not insulate you from your mattress.
Measure for a dip first, and sort the anchoring on day one. If you want deep cushioning rather than a small change, foam is what you want and you should accept the warmth.
Where this sits
Other pages on this site that bear on the same decision.
- Silentnight Review: Every Model, Scored
- Mattress Topper Reviews
- Best mattress toppers
- Silentnight Discount Codes
Questions people ask
What is a spacer mesh topper?
Two textile faces held apart by a dense forest of vertical fibres, with open air between them, so air moves through the layer you lie on. Worth knowing because the Airmax is not one: Silentnight describes hollowfibre fill with air mesh sides, which is a border rather than a layer.
Why is memory foam the wrong topper for a warm sleeper?
Memory foam responds to body heat by design and has small closed cells with almost no air movement. Adding a layer puts insulation between you and your mattress's airflow, and on a hybrid it cuts you off from the cooling you bought it for.