Firmness
Medium Firm
Type
Hybrid
Depth (cm)
23
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
5
Price Range
£249 to £475
Best Sleeping Position(s)
Certifications
Assessed from Horizon's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw is value. From £249, you get pocket springs rather than a basic open coil unit, which means each of the 800 springs moves independently, so a restless partner is less likely to wake you. The 2cm graphite-infused memory foam layer contours to your body and helps relieve pressure on joints, back and hips, and graphite is added to help with cooling. Delivery is flexible: next day on weekdays, a weekday of your choice up to 60 days ahead, or weekend delivery, with a two-hour time slot. Old mattress removal costs £35.00 and room-of-choice delivery £20.00. The memory foam layer is slim, but at this price that trade-off is fair.
Key Features & what's inside
- 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.
Who's it NOT for?
At 23cm deep with a 2cm memory foam layer, this isn't a deeply cushioned mattress, so heavier sleepers or those who love a sink-in feel may want more comfort material. Anyone after a properly firm surface should also look elsewhere, as Horizon rates the feel as medium.
Horizon Odyssey 800 Pocket Memory Mattress
Across the 159 reviews on the mattressonline.co.uk product page, which average 4.6 out of 5, owners report comfortable, supportive sleep with minimal movement transfer and a medium-firm feel that suits those wanting back support. Reviewers also praise the material quality for the price, the compressed delivery and easy setup.
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How firm is the Horizon Odyssey 800 mattress?
Horizon rates it as medium. Owner reviews on mattressonline.co.uk describe the feel as medium-firm with good back support, so expect a balanced surface rather than a soft or very firm one. Lightweight side sleepers wanting a plush feel may find it slightly too supportive.
Does the Horizon Odyssey 800 come with a trial?
Yes, it comes with a 100-night trial, so you can sleep on it at home for a full season before committing. There's also a 5-year guarantee covering the mattress itself.
Is the Horizon Odyssey 800 good for couples?
It's a reasonable choice. The 800 pocket springs move independently with no motion transfer, which means one of you turning over shouldn't disturb the other. It's available in Small Double, Double, King and Super King sizes.
What is the Horizon Odyssey 800 made of?
It's a hybrid with two working layers: a 2cm graphite-infused memory foam layer on top of 800 individual pocket springs, wrapped in a knitted cover. The overall depth is 23cm. It's hypoallergenic and fire resistant, conforming to BS7177: 2008 for home use.
How much does the Horizon Odyssey 800 cost?
Prices range from £249 to £475 depending on size, starting at £249.00 for the UK Single. That's budget territory for a pocket sprung hybrid, and delivery to most locations is free, with a two-hour time slot provided.
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