Silentnight Aloe Vera Castleton 800 Pocket Eco King Size Mattress
The Silentnight Aloe Vera Castleton 800 Pocket Eco Mattress uses 800 individual Mirapocket springs with firmer support through the centre, which means your body stays supported while a partner's movements are less likely to wake you.
- Medium feel for most sleepers
- Minimises partner disturbance
- Aloe vera-infused soft-touch cover
£549
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Silentnight Aloe Vera Castleton 800 Pocket Eco Mattress
More available sizes
Mattress details
Mattress
Silentnight Aloe Vera Castleton 800 Pocket Eco Mattress
Size
Firmness
Medium
Construction
Eco-Friendly
Pocket Spring
Depth (cm)
Layers
Layer Details
Key benefits
- More room each than a double: You get 7.5cm more width each than the UK double, which means a little more space before an elbow or knee lands on your partner's side.
- Quieter when schedules differ: The independent Mirapocket springs limit how far movement carries, so a partner leaving for an early shift is less likely to wake whoever is still asleep.
- Length for a taller sleeper: At 200cm long it is 10cm longer than the UK double, so a partner over six foot is less likely to find their feet hanging off the end.
- Space to shift during pregnancy: The extra width leaves room for a support pillow and frequent changes of position without either of you ending up squeezed towards the edge.
- Support across a wider surface: The firmer centre zone sits where both sleepers carry most of their weight, which helps on a bed shared by two people of different builds.
- Cooler with two bodies sharing: Comfort Breathe fibres help regulate temperature, which matters more when two people are giving off heat on one mattress all night.
This size suits you if...
You share the bed every night and keep waking each other on a double, or one of you is over six foot and the length is the real upgrade. It also suits couples on different schedules who want a little more distance from each other.
Consider another size if...
Your bedroom is under our suggested minimum of 2.7m x 2.9m, perhaps a new build master filled with wardrobes. The UK double would suit you better, and we suggest at least 2.6m x 2.8m for it.
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FAQ's
What room size do I need for a Silentnight Castleton 800 Pocket Eco UK king?
We suggest allowing at least 2.7m x 2.9m, with 3.2m x 3.2m feeling comfortable. New build master bedrooms can feel smaller once fitted wardrobes are in, so measure the floor space that is actually free rather than the room on the plan.
How much space does each person get on a UK king Castleton 800?
Two people sharing get 75cm each. That is 7.5cm more each than the UK double, which gives 67.5cm, and 15cm less each than the UK super king, which gives 90cm.
Is a UK king long enough for someone over 6ft?
The UK king is 200cm long, 10cm longer than the UK double and the same length as the UK super king. For a partner over six foot, that extra length can matter more than the added width, because the mattress has more room before the feet run out.
Should we get the Castleton 800 Pocket Eco in UK king or UK super king?
The UK super king is 30cm wider and gives 90cm each, which helps if a dog regularly joins you. It needs more space, though: we suggest at least 3m x 2.9m, compared with 2.7m x 2.9m for the UK king. Both are 200cm long.
What bedding fits a UK king Silentnight Castleton 800 mattress?
Look for UK king sheets made for a 150 x 200cm mattress, along with a 230 x 220cm king duvet. Silentnight doesn't publish a depth for this mattress, so check the depth with the retailer before choosing fitted sheets with deep pockets.