Available 
Rock Hard Super Firm Foam Mattress
from £319-£599.
£319-£599
Sizes tracked: Single, Small Double, Double, King Size, Super King
Sleep guide
How to choose the right mattress for your sleeping position
Choose a mattress that suits how you sleep by comparing pressure relief, support, firmness and real product details from three firm memory foam examples.
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Last verified: 2026-10-13
Why sleeping position matters
Your sleeping position changes where your body presses into a mattress, so the main job is to balance pressure relief with support. Side sleepers usually need more cushioning at the shoulders and hips, while back and front sleepers often need firmer support to help keep the spine feeling level. In this shortlist, Rock Hard Super Firm Foam Mattress (£319-£599), Bodyshape Ortho Memory Foam Mattress (£199-£349) and Bodyshape Vitality Memory Foam Ortho Mattress (£189-£359) all sit in the firm memory foam bracket, so they are more naturally aligned with back- and front-sleeper guidance than with softer side-sleeper preferences.
Best mattresses for side sleepers
Side sleepers generally want a mattress that eases pressure at the shoulders and hips, because those points take more of the load in this position. The three examples here are all labelled firm, so they are worth comparing carefully if you like a steadier surface, but a very firm feel can be too unforgiving for some side sleepers. Bodyshape Ortho Memory Foam Mattress (£199-£349) and Bodyshape Vitality Memory Foam Ortho Mattress (£189-£359) may be lower-cost entry points into this firmer feel, while the Rock Hard Super Firm Foam Mattress (£319-£599) is the most support-led and likely the least yielding.
Best mattresses for back and front sleepers
Back sleepers often do well with balanced support, and front sleepers usually need the firmest feel of the three main positions to help stop the hips sinking too far. That makes this shortlist more relevant to shoppers who want a firm orthopaedic feel than to those chasing a plush surface. The Rock Hard Super Firm Foam Mattress is described as a full foam block with no springs and extremely firm from edge to edge, while the Bodyshape Ortho Memory Foam Mattress uses 17cm of reflex support with a 3cm memory foam layer for a little more contouring on top.
How to match position with mattress type
Once you know your preferred position, look beyond the firmness label and compare construction, depth and base fit. All three examples are memory foam and each comes in five common sizes — Single, Small Double, Double, King Size and Super King — so size choice is broad and the bigger differences are feel and price. The Rock Hard Super Firm Foam Mattress is 23cm deep, and the retailer notes depth can affect bedding and bed-frame suitability, so that is worth checking alongside whether you want no springs, layered foam or a more pressure-relieving top layer.
What the retailer pages show at a glance
The visible comparison is fairly tight on paper, but the review volume and price bands help separate the examples. Rock Hard Super Firm Foam Mattress shows a 4.7/5 rating from 362 reviews, Bodyshape Ortho Memory Foam Mattress shows 4.5/5 from 349 reviews, and Bodyshape Vitality Memory Foam Ortho Mattress shows 4.5/5 from just 2 reviews, so that last score should be treated cautiously. All three mention a 100-night comfort trial, UK-made construction and a guarantee, which lowers the risk of choosing a firmness level online, but prices and availability can change, so it is sensible to check the retailer page before ordering.
How to turn the shortlist into a buying decision
The simplest way to compare these mattresses is by budget, firmness and how support-led you want the feel to be. If you want the firmest, most support-focused example, Rock Hard Super Firm Foam Mattress sits at the top end of the range at £319-£599; if you want a lower entry price, the Bodyshape models start at £189 and £199 respectively, with Vitality the cheapest at the lower end. Because all three offer the same five sizes, the real trade-off is not size coverage but construction, depth and how confident you feel about the available review volume and trial terms.
Mattresses to use as comparison examples
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 Ortho Mattress
from £189-£359.
£189-£359
Sizes tracked: Single, Small Double, Double, King Size, Super King
Retailer details used
Last checked 2026-10-13. 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.
- Rock Hard Super Firm Foam Mattress | MattressOnlineproduct-page evidence for Rock Hard Super Firm Foam Mattress
- Bodyshape Ortho Memory Foam Mattress | MattressOnlineproduct-page evidence for Bodyshape Ortho Memory Foam Mattress
- Bodyshape Vitality Memory Foam Ortho Mattress | MattressOnlineproduct-page evidence for Bodyshape Vitality Memory Foam Ortho Mattress
- Mattress Shopping | Sleep FoundationGeneral firmness guidance by sleeping position and body type
- Mattress Firmness: Finding the Best Firmness for You!Position-by-position firmness ranges and body-weight considerations
- How to Choose a Mattress: Finding Your Perfect MatchPressure relief, support and buying-framework guidance
Helpful next reads
Use these related mattresses guides and reviews to turn the advice into a practical shortlist.
Firmness questions
Which mattress firmness is usually best for side sleepers?
Side sleepers often need more cushioning than firmer beds provide, because the shoulders and hips press into the surface more. A firmer memory foam mattress can still work if you prefer a steadier feel, but very firm models like Rock Hard Super Firm may feel too hard for some side sleepers.
Are firmer mattresses better for back sleepers and front sleepers?
Often, yes. Back sleepers usually need enough support to avoid sagging, and front sleepers often benefit from the firmest feel to help keep the hips from sinking too far. The firm memory foam options here are more aligned with that guidance than with softer side-sleeper needs.
Does a 100-night comfort trial make online mattress shopping safer?
It can reduce the risk if you are unsure about firmness, because you get time to judge comfort at home. All three examples mention a 100-night comfort trial, but you should still check the latest terms, guarantee length and whether the price has changed before ordering.
Do these mattresses come in common sizes like Single, Double and King Size?
Yes. Rock Hard Super Firm Foam Mattress, Bodyshape Ortho Memory Foam Mattress and Bodyshape Vitality Memory Foam Ortho Mattress all show Single, Small Double, Double, King Size and Super King options, so the main comparison is feel and price rather than size availability.