Available 
Bodyshape Vitality Memory Foam Ortho Mattress
from £158-£305.
£158-£305
Sizes tracked: Single, Small Double, Double, King Size, Super King
Mattress Online Memory Foam
Rock Hard Super Firm Foam Mattress review
Rock Hard Super Firm Foam Mattress is a super-firm, springless memory foam mattress with edge-to-edge support, five tracked sizes and a reassurance package that includes a 10-year guarantee and 100-night comfort trial.
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Last verified: 2026-07-21
Quick verdict
Rock Hard Super Firm Foam Mattress is aimed at shoppers who want a very firm, springless foam feel rather than a cushioned one. It sits above the comparable-product median at £258, so the value case is strongest if the extra-firm support, 23cm depth and Mattress Online trial terms are exactly what you want. Check the live size price and stock before you commit, especially if you need Super King.
Available sizes and prices
Rock Hard Super Firm Foam Mattress is listed with 5 size options from £258-£484. The visible sizes include Single, Small Double, Double, King Size, so use the table to compare the option that matches the exact size, colour, format or specification you want. Always confirm the final checkout price, delivery charge and stock status on the retailer page.
Key product details
These are the retailer details worth checking first for Rock Hard Super Firm Foam Mattress: Brand: Mattress Online; Type: Memory Foam; Firmness: Firm; Sizes tracked: Single, Small Double, Double, King Size, Super King. Treat them as a quick fact sheet, then use the retailer page to verify any installation, warranty, delivery or model-number details before buying.
| Brand | Mattress Online |
|---|---|
| Type | Memory Foam |
| Firmness | Firm |
| Sizes tracked | Single, Small Double, Double, King Size, Super King |
| Price range | £258-£484 |
| Owner rating signal | 4.7 out of 5 shown; review volume needs checking with the retailer |
| Last checked | 2026-07-21 |
What the product page says
Mattress Online describes the Rock Hard Super Firm Foam Mattress as firm and also uses extra-firm wording. The listing says it is a full foam block with no springs, gives consistent edge-to-edge support, includes a knitted cover, is single-sided for easier care, and has a 23cm depth. It is also shown with rolled-up delivery, which is worth checking if you want a mattress that is easier to move into place.
What the wider comparison adds
The clearest context is the review and reassurance package: the page shows a 4.7/5 rating with 359 reviews, plus a 10-year guarantee and 100-night comfort trial. In the comparison set, the median price is £194, so this model’s £258 starting point sits above the middle of the pack, while its five tracked variants are about average for the group. That makes it more of a firmness-led shortlist than an obvious budget buy, and it is worth comparing against lower-priced Bodyshape memory foam options if price matters as much as feel.
Buyer trade-offs to weigh
The main trade-off is simple: you are paying a bit more than the comparison median for a very firm, springless foam build and a strong retailer reassurance package. If you want a steady, less cushioned mattress and like the look of the 100-night comfort trial, the price may feel easier to justify; if you are unsure about extra-firm comfort, a lower-priced Bodyshape alternative could be the safer comparison. Also check live stock and size-specific pricing, because the Super King variant was shown as out of stock at the time of checking.
Price and value benchmark
Tracked prices run from £258 for a Single up to £464 for a Super King, with Small Double, Double and King Size sitting in between. Because the price spread is size-led, value depends on the exact format you need rather than one headline number, and the five tracked variants are roughly in line with the comparison-set median of five. For a fair check, compare the exact size you want against the nearest Bodyshape pricing and confirm today’s delivery cost before checkout.
How it compares with nearby alternatives
The nearest comparison points are Bodyshape memory foam mattresses, which start lower and may suit shoppers who want to spend less on a similar category of mattress. Rock Hard Super Firm Foam Mattress stands out for its extra-firm wording, no-springs construction and edge-to-edge support, while Bodyshape options are useful if you want to pressure-check the budget first. If your priority is firmness over plushness, compare construction and size pricing carefully; if not, the cheaper Bodyshape route may be the better fit.
Review rating and caveat
The displayed 4.7/5 rating is a positive reputation cue, and the 359-review figure gives it more context than a tiny sample would. Even so, the evidence shown here is retailer-linked rather than independent active proof, so it should be read as a buying signal rather than a guarantee of comfort in your own room. For a firmer model like this, the most useful check is whether the review volume and size-specific feedback match the exact version you plan to buy.
Who it suits
This mattress suits shoppers who actively want a very firm feel, springless foam construction and steady support from edge to edge. It also makes sense for buyers who prefer a simpler single-sided mattress and want the reassurance of a 10-year guarantee plus a 100-night comfort trial from Mattress Online. If you are comparing bed-frame practicality as well as comfort, the 23cm depth is a useful figure to check against your bedding, topper and frame clearance.
Who should look elsewhere
If you want a softer, more cushioned memory foam feel, this Mattress Online model is unlikely to be the best fit because the listing repeatedly stresses firm and extra-firm support. It is also worth skipping if you are mainly shopping on price, since the starting cost sits at £258 and lower-priced Bodyshape alternatives are available in the same memory-foam category. Anyone with an older frame, tight bedding clearance or uncertainty about firm comfort should verify the 23cm depth and size dimensions before ordering.
Comfort and support
Comfort here is built around the Rock Hard Super Firm Foam Mattress’s full foam block, no-springs structure and consistent support from edge to edge, rather than deep contouring. Mattress Online also uses orthopaedic wording, but that should be treated as a support claim from the retailer, not medical advice or a promise of pain relief. In practical terms, this is the sort of mattress to compare if you want a stable surface that does not sink much, and the 23cm depth plus single-sided build are part of that straightforward, firm-finish package.
Value check
Value is decent only if the super-firm feel is the main reason you are shopping, because the price sits above the comparable median even before you factor in delivery. The 10-year guarantee and 100-night comfort trial strengthen the reassurance package, but they do not change the fact that this is a higher-priced firmness-led model compared with some Bodyshape alternatives. Check the live price for your size, confirm stock, and judge whether the support style is worth the extra spend for your own setup.
Good alternatives to compare
The closest alternatives to compare with Rock Hard Super Firm Foam Mattress include Bodyshape Vitality Memory Foam Ortho Mattress, Bodyshape Ortho Memory Foam Mattress, Bodyshape Vitality Memory Foam Mattress. Use these cards to check whether a nearby model gives you a better price, a more suitable specification or a clearer match for your space and budget.
Available 
Bodyshape Ortho Memory Foam Mattress
from £199-£349.
£199-£349
Sizes tracked: Single, Small Double, Double, King Size, Super King
Available 
Bodyshape Vitality Memory Foam Mattress
from £189-£359.
£189-£359
Sizes tracked: Single, Small Double, Double, King Size, Super King
Retailer details used
Last checked 2026-07-21. 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.
More mattresses to compare
These related guides and reviews can help you compare nearby options before buying.
Questions about this mattress
Is Rock Hard Super Firm Foam Mattress worth considering if I want a very firm feel?
Yes, it is a sensible shortlist option if you deliberately want an extra-firm, springless foam mattress with edge-to-edge support. The price starts at £258, so it is most appealing when that firmer feel is exactly what you want rather than a broad all-round bargain.
How does the price vary by size?
Tracked prices run from £258 for a Single to £464 for a Super King, with Small Double, Double and King Size in between. Because size changes the price a lot, check the exact version you need before comparing value with Bodyshape or any other memory foam alternative.
Does the 4.7/5 rating mean it has been independently tested?
No. The 4.7/5 figure is a review rating shown on the product page, but it should be treated as retailer-linked reputation context rather than proof of active performance. The more useful checks are the 359-review figure, the 10-year guarantee and the 100-night comfort trial.
What do the guarantee and comfort trial add?
They add reassurance, not a comfort promise. Mattress Online shows a 10-year guarantee and a 100-night comfort trial, which help if you want a clearer return path and longer coverage, but you should still make sure the extra-firm feel is right for your preferences.
Is the 23cm depth and single-sided build practical?
Usually yes, but you should still verify bed-frame clearance, bedding fit and handling needs. A 23cm mattress can affect topper compatibility and the way sheets sit, while the single-sided design means easier care than a flippable mattress, not a different comfort level.