Silentnight Air Plus 1200 Mirapocket Mattress
The Silentnight Air Plus 1200 Mirapocket Mattress uses a layer of Air Plus fibres designed to increase airflow, which means heat and moisture are less likely to build up while you sleep.
- Extra airflow to dispel heat
- Firmer centre support for hips & back
- Single-sided, no turning needed
£489
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The Silentnight Air Plus 1200 Mirapocket is a mid-range, 26cm deep pocket spring mattress rated medium by Silentnight. Air Plus fibres and soft white fibres sit over Mirapocket springs that are firmer through the centre third. It suits sleepers who want a medium feel that stays breathable. It's listed in a UK single, UK small double, UK double, UK king and UK super king. Silentnight gives a 5-year guarantee, and Mattress Online offers its own 100-night comfort trial.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
26
Number of Layers
3
Trial Period (nights)
Warranty (years)
Price Range
£489
Best Sleeping Position(s)
Back Sleeping
Combination Sleeping
Side Sleeping
Certifications
BS 7177
Assessed from the specification published by mattressnextday.co.uk, captured October 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The top layer is made of Air Plus fibres, designed to move air through the mattress and carry heat and moisture away, which helps if you tend to sleep warm. Soft white fibres beneath add to the medium feel without making it plush. The Mirapocket springs are zoned so the centre third is firmer, giving your back and hips more support where they need it. It's single-sided, so you never have to flip it, and the cover is hypoallergenic. A reinforced rod edge border helps the sides keep their shape. It suits most back and side sleepers, although anyone wanting a very firm or very plush feel may want something different.
Key features & layer details
Air Plus fibres
A layer of fibres designed to increase airflow through the mattress and dispel heat and moisture. For you, that means less trapped warmth overnight.
Soft white fibres
A breathable, soft layer of fibres that enhances the medium feel. It adds comfort over the springs without making the surface plush.
Mirapocket springs
1200 Mirapocket springs in fabric pockets, with the centre third zoned firmer. That gives your back and hips extra support, though the count isn't confirmed for every size.
Layer details from mattressnextday.co.uk product page, October 2026.
Best suited for?
Warm sleepers
The top layer of Air Plus fibres is designed to move air through the mattress and carry heat and moisture away, so less warmth stays trapped overnight.
Back sleepers
Zoned Mirapocket springs are firmer through the centre third, which gives your hips and back extra support while the medium feel keeps the surface comfortable.
Side sleepers
A medium feel with soft white fibres over the springs adds comfort without turning plush, so the surface gives a little where shoulders and hips press in.
Allergy sufferers
The hypoallergenic cover suits anyone who wants a sleep surface designed with allergies in mind, and the breathable fibre layers keep the overall feel fresh.
If you prefer sleeping on a firm mattress, this might not be the best choice. Silentnight rates it medium, and the soft fibres on top add to that feel. It's also single-sided, so you can rotate it head to toe but not flip it. Mattress Next Day gives the spring count for a UK king only, so the UK small double count isn't confirmed.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Silentnight Air Plus 1200 Mirapocket Mattress
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FAQ's
How firm is the Silentnight Air Plus 1200 Mirapocket?
Silentnight rates it medium. The soft white fibres enhance that medium feel, and the springs are firmer through the centre third. It suits sleepers who want a balanced feel, but not anyone after a firm or very soft surface.
How deep is the Silentnight Air Plus 1200 Mirapocket?
It's 26cm deep in every size listed. That's a fairly standard depth, so it should sit comfortably on most bed frames, though it's worth checking any headboard or side-rail clearance first.
How many springs does the Silentnight Air Plus 1200 Mirapocket have?
Mattress Next Day says up to 1200 Mirapocket springs in a UK king, and the count for the UK small double isn't confirmed. They're individually pocketed in fabric and zoned firmer through the centre third.
Does the Silentnight Air Plus 1200 Mirapocket come with a trial?
Mattress Online offers its own 100-night comfort trial. It requires buying a mattress protector from Mattress Online, and it's exchange only. Silentnight also gives a 5-year guarantee on the mattress.
Is the Silentnight Air Plus 1200 Mirapocket good for hot sleepers?
It should help. The Air Plus fibres are designed to increase airflow and dispel heat and moisture, and the fibre layers are breathable. Silentnight doesn't describe it as a dedicated cooling mattress, so expect a breathable feel rather than a cool-touch surface.
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