Silentnight UltraGel 3000 Mirapocket Box Top Softer Mattress
Silentnight · Memory Foam · Medium Firm
Silentnight · Memory Foam · Medium Firm from £759-£1,299.
£759-£1,299
Sizes tracked: Single, Small Double, Double, King Size, King
Sleep guide
What mattress firmness do I need?
Firmness is one of the easiest mattress details to notice and one of the easiest to oversimplify. This guide explains how to compare soft, medium, firm and extra firm options without treating comfort as a medical promise.
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Last verified: 2026-06-05
Start with your sleep position
Side sleepers often look for more pressure relief around the shoulder and hip, while back and front sleepers may prefer a flatter, firmer surface. Body weight, pillow height and bed base can change how the same mattress feels.
Check construction as well as the label
A medium pocket sprung mattress can feel different from a medium memory foam mattress. Look at the comfort layer, spring system, depth, edge support and whether the product is no-turn or needs rotating.
Do not read orthopaedic as a health promise
Orthopaedic and extra firm mattresses can suit people who like a firmer surface, but they should not be treated as clinical care. If pain is persistent or severe, ask a qualified health professional for advice.
Mattresses to use as comparison examples
Sleepeezee Jessica 1800 Pocket Gel Mattress
Sleepeezee · Memory Foam · Medium Firm
Sleepeezee · Memory Foam · Medium Firm from £649-£1,299.
£649-£1,299
Sizes tracked: Single, Small Double, Double, King Size, King
SleepSoul Heaven 1000 Pocket Gel Mattress
SleepSoul · Memory Foam · Medium Firm
SleepSoul · Memory Foam · Medium Firm from £215-£405.
£215-£405
Sizes tracked: Single, Small Double, Double, King Size, King
Sources and last checked
Last checked 2026-06-05. This page uses 1 source signals, including retailer product information, comparable products and any cited public context available during the latest check.
Helpful next reads
Use these related mattresses guides and reviews to turn the advice into a practical shortlist.
Firmness questions
Is a firm mattress always better for support?
No. Support depends on how well the mattress keeps your body comfortably aligned. Some sleepers feel better on firm designs, while others need more cushioning.
What firmness is best for side sleepers?
Many side sleepers prefer medium or medium-firm mattresses with pressure relief around the shoulder and hip, but body weight and personal comfort matter.
Can a mattress solve back pain?
A mattress can affect comfort and support, but it should not be described as a health fix. Persistent pain should be discussed with a qualified professional.
Should I choose memory foam or pocket springs?
Memory foam usually gives closer contouring, while pocket springs provide responsive support. Hybrid mattresses combine elements of both.
Does mattress depth matter?
Depth can affect comfort layers, support structure and how the mattress sits on your bed frame. Very deep mattresses may need deeper fitted sheets.