Available 
Harrison Spinks Bordley Natural 2750 Pocket Firmer Mattress
from £595-£1,185.
£595-£1,185
Sizes tracked: Single, Double, King Size, Super King
Sleep guide
How to choose a mattress for back support
Compare firmness labels, support feel and sleep position with three Mattress Online examples so you can shortlist a mattress that fits your comfort and frame.
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Last verified: 2026-10-07
What people mean by back support
When shoppers talk about back support, they usually mean two different things: how stable the mattress feels and how comfortably it lets your body settle. Firmness is the surface feel you notice first, while support is the way the mattress holds your body across its layers and springs. That matters here because Harrison Spinks Bordley Natural 2750 Pocket Firmer is marked medium-to-firm at £595-£1,185, Wentworth Mercer Natural Pocket 2000 Ortho is extra-firm at £474-£764, and Luna 4000 Support Gel Memory Pocket Hybrid is medium-to-firm at £266-£677.
How sleep position affects support needs
Your sleep position changes what to prioritise. Back sleepers often look for a balance of support and surface comfort, side sleepers may need a little more pressure comfort at the shoulders and hips, and front sleepers usually prefer a steadier feel that limits sinking at the midsection. The key point is that the retailer labels here are just labels: medium-to-firm on Harrison Spinks and Luna, and extra-firm on Wentworth, do not guarantee the same feel for every body shape or sleeping position.
Which mattress types can help
The three examples show how different constructions can reach a firmer-feeling brief in different ways. Harrison Spinks uses pocket springs with wool fillings, Wentworth combines pocket springs with cotton comfort layers, and Luna pairs pocket springs with gel foam and memory foam elements. If you want a more natural-feeling build, the Harrison Spinks option is the most obviously premium and natural-led of the trio; if you want the lowest starting price and a hybrid format, Luna begins at £266; if you want the clearest orthopaedic-style label, Wentworth is the extra-firm pocket sprung option.
How to check real-world fit before you buy
Support is only part of the buying decision. Mattress depth affects bedding, toppers and bed-frame compatibility, so it is worth checking the exact depth on the retailer page before ordering, especially if your frame has shallow side rails or you already use a topper. Mattress Online also shows free delivery to most locations, an old mattress removal service and a 100-night comfort trial on all three examples, but the trial terms should still be checked carefully because they are conditional rather than open-ended.
What the shortlist suggests
This small shortlist gives a useful spread for comparison rather than a full market view. Prices run from £266 on the Luna 4000 Support Gel Memory Pocket Hybrid Mattress to £1,185 on the top end of Harrison Spinks Bordley Natural 2750 Pocket Firmer, with Wentworth Mercer Natural Pocket 2000 Ortho sitting in the middle at £474-£764. review details are positive but modest in scale: Harrison Spinks shows 4.8/5 from 10 reviews, Wentworth 4.4/5 from 7, and Luna 4.7/5 from 30, so treat them as shopper feedback rather than proof of durability or medical benefit.
If you want the firmest-feeling label in this set
Wentworth Mercer Natural Pocket 2000 Ortho is the clear extra-firm label here, and it also sits above the cheapest Luna in price at £474-£764. That makes it the obvious comparison point if you want a firmer-feeling pocket sprung mattress and do not mind paying more than the entry-level hybrid. Just remember that extra-firm is a retailer label, not a promise of the same comfort for every sleeper, so your frame, body shape and sleeping position still matter.
Mattresses to use as comparison examples
Available 
Wentworth Mercer Natural Pocket 2000 Ortho Mattress
from £474-£764.
£474-£764
Sizes tracked: Single, Double, King Size, Super King
Available 
Luna 4000 Support Gel Memory Pocket Hybrid Mattress
from £266-£677.
£266-£677
Sizes tracked: Single, Small Double, Double, King Size, Super King
Retailer details used
Last checked 2026-10-07. The source list below is included to help you check the details behind the comparison. Always confirm the latest price, delivery cost, stock status and product details with the retailer before buying.
- Harrison Spinks Bordley Natural 2750 Pocket Firmer Mattress | MattressOnlineproduct-page evidence for Harrison Spinks Bordley Natural 2750 Pocket Firmer Mattress
- Wentworth Mercer Natural Pocket 2000 Ortho Mattress | MattressOnlineproduct-page evidence for Wentworth Mercer Natural Pocket 2000 Ortho Mattress
- Luna 4000 Support Gel Memory Pocket Hybrid Mattress | MattressOnlineproduct-page evidence for Luna 4000 Support Gel Memory Pocket Hybrid Mattress
- Kovacs et al Lancet 2003 mattress firmness trialLimited clinical evidence, not brand endorsement
- MattressOnline 100-night trialConditional exchange terms
- Harrison Spinks Bordley FirmerShortlist construction, firmness and owner sample
Helpful next reads
Use these related mattresses guides and reviews to turn the advice into a practical shortlist.
Firmness questions
Is a firmer mattress always better for back support?
No. A firmer label can suit some sleepers, but support and comfort are not the same thing. The better check is whether the mattress suits your sleep position, body shape and frame without feeling too hard or too soft for you.
What is the difference between support and firmness?
Firmness is the immediate feel of the surface, while support is how the mattress holds you through its spring and comfort layers. A medium-to-firm mattress can still feel quite different from another medium-to-firm model, especially when you compare pocket sprung, wool-filled and hybrid constructions.
Do mattress depth and bed frame compatibility matter when choosing a mattress?
Yes. Depth can affect bedding, toppers and whether the mattress sits properly on your frame, so it is worth checking before you buy. That is especially useful if you are choosing between the 25cm-style hybrid end of the range and the deeper premium pocket sprung options.
How useful are review ratings and comfort trials when comparing these mattresses?
They are useful, but only as part of the decision. The ratings here come from small samples, while the 100-night comfort trial may have conditions such as minimum use or exchange terms, so always check the current retailer page before ordering.
Which of these examples looks best for a budget-conscious shopper?
Luna 4000 Support Gel Memory Pocket Hybrid is the lowest starting price at £266, so it is the most obvious budget comparison point. If you want the cheapest entry, it is worth checking whether the hybrid feel, depth and available size options match your base and comfort preferences.