Horizon Odyssey 800 Pocket Memory Mattress
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Mattress
Horizon Odyssey 800 Pocket Memory Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
23
Layers
2
Layer Details
Memory Foam
A 2cm memory layer that contours to your body for personalised comfort and helps relieve pressure on joints, back and hips. It's a cooling layer too, which matters if you tend to sleep warm.
Pocket Springs
800 individual pocket springs that move independently, which means support tailored to where your body needs it and no motion transfer. In practice, you're less likely to feel a partner turning over.
Layer details from mattressonline.co.uk product page, September 2026.
- Fits the average UK bedroom: At 135 x 190cm it sits comfortably in most rooms; we suggest allowing at least 2.6m x 2.8m so you can still walk round it.
- Room for bedside tables on both sides: In a typical bedroom this width usually leaves space for a table each side, which a UK king often takes away.
- Motion isolation where it matters: With 67.5cm each, you and your partner sleep fairly close, so the 800 independent pocket springs help stop one person's turning waking the other.
- Easy, affordable bedding: Double sheets and 200 x 200cm duvets are sold everywhere at every price point, which keeps the whole setup cheap, matching the mattress itself.
- A sensible guest room size: The UK double handles visiting couples and solo guests equally well, and the medium firm feel is a safe middle ground for people you can't ask in advance.
This size suits you if...
You share the bed as a couple in a typical UK bedroom and want the classic size that leaves room for furniture, you're kitting out a guest room that needs to sleep visiting couples, or you're furnishing a first flat on a tight budget and a double keeps both the mattress and the bedding affordable.
Consider another size if...
You and your partner both want more personal space than 67.5cm each and your room measures at least 2.7m x 2.9m. In that case we'd recommend the UK king instead, which is 15cm wider and 10cm longer.
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Is the Horizon Odyssey 800 UK double big enough for two adults?
Yes, for most couples. The UK double gives you 67.5cm of width each, which works well if you sleep fairly close or are average build. The 800 pocket springs move independently, so you're less likely to feel a partner shifting despite the shared space. Taller or broader couples may prefer the extra 15cm of the UK king.
What room size do I need for the Horizon Odyssey 800 in a UK double?
We suggest a room of at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That's our guidance rather than Horizon's, and it allows for opening drawers and walking round the bed. In most UK bedrooms the double also leaves room for bedside tables on both sides.
Is the UK king worth it over the UK double for this mattress?
Only if your room can take it. The UK double is 15cm narrower and 10cm shorter than the UK king, and for the king we suggest a room of at least 2.7m x 2.9m. If yours is smaller, the double is the better call: you keep floor space and bedside tables, and bedding costs less.
Does the Horizon Odyssey 800 double suit a guest room?
It's a strong fit. The UK double sleeps visiting couples as well as solo guests, and the medium firm feel is a reasonable compromise for people whose preferences you don't know. Since it's a budget-friendly hybrid, you're getting pocket springs in a spare room without spending main-bedroom money.
Where can I buy the Horizon Odyssey 800 in a UK double?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them, so it's worth checking before you order. Stock and delivery options vary by retailer, and at 135 x 190cm the double is one of the most widely stocked sizes in the UK.