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comparisonLast updated on 11 February 2025

Ergoflex 5G vs Silentnight Just relax 3 zone

Easily compare the Silentnight Just relax 3 zone vs Ergoflex 5G Mattresses side-by-side.

Ergoflex 5G mattress image on Mattress Zone UK
just relax 3 zone memory foam mattress
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At a glance

Recommended For
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What we like
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Keep in Mind
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Essential Mattress Info

Brand
Ergoflex (UK)Silentnight
About
Mattress Type
Memory foamAll Foam
Prices
Video
Certifications
CertiPur-US®
CertiPur-US®✕
OEKO-TEX®
OEKO-TEX®✕

Trial & Warranty

Trial Period
✓✓
Trial Period (nights)
30365
Warranty Length (years)
1010

Firmness Options

One Firmness Fits All?
✓✓
Adjustable Firmness
✕✕
Half-Half Firmness
✕✕
Selectable Firmness
✕✕
Flippable / Reversible Firmness
✕✕
Firmness Info
The Ergoflex 5G mattress was meticulously developed to provide an optimum level of support and find that it performs for the vast majority of people, regardless of body type and sleeping style. This one "perfect" mattress, rated medium-firm uses the highest-quality materials available.
The Silentnight Just Relax 3 Zone Mattress offers a **medium firmness level**, providing a balanced combination of support and comfort. This makes it suitable for a wide range of sleepers, accommodating various sleeping positions and preferences.

Mattress Construction

Materials Overview
Ergoflex, established in 2006, is the only mattress-in-a-box brand that has been around longer than the warranty. The Ergoflex 5G mattress is a true, high-density orthopaedic pressure-reducing mattress that comprises of 3 premium foam layers:
  • Tencel® Outer Cover
  • Protective Inner Cover
  • 9cm Visco-Elastic Memory Foam
  • 5cm Cool-Sleep Airflow Layer
  • 9cm High-Resilience Foam Base.
The Silentnight Just Relax 3 Zone Mattress is crafted for ultimate comfort and support. It features a body-moulding memory foam layer that adapts to your body’s contours, delivering exceptional relaxation. The innovative 3-zone Miratex support system provides targeted cushioning for your shoulders, hips, and lower back, ensuring spinal alignment and relieving pressure points to prevent aches and pains. Wrapped in a luxuriously soft, hypoallergenic knit fabric, it offers a clean and cozy sleeping surface ideal for allergy sufferers.
Comfort Info
Sleeping on the Ergoflex 5G gives a feeling of pure weightlessness, allowing you to find that comfortable sleep position quicker. Zero partner disturbance technology reduces the likelihood of being woken by a restless sleeping partner, which allows you to experience deeper, more restorative sleep.
Memory Foam Comfort Layer The Silentnight Just Relax 3 Zone Mattress features a memory foam layer that molds to your body’s shape, delivering personalized comfort and reducing pressure buildup. This ensures a cozy, cradled feel every night.
Support Info
The Ergoflex 5G mattress is the only true high density memory foam mattress available, the ILD (indentation load deflection) is comparable only to TEMPUR®, and it is technically more advanced and superior in performance to every alternative both in this price range and beyond. Designed to mould itself to the contours of your body it provides instant comfort, more support and better sleep. This confidence is matched by customers making repeat purchases for additional mattresses time and time again. It is recommended by Practioners for those that suffer from back pain, fibromyalgia, circulation problems and joint complaints or to those simply in need of a good night's sleep.
Miratex 3-Zone Support System This cutting-edge support system divides the mattress into three targeted zones, ensuring optimal support for the shoulders, hips, and lower back. By promoting proper spinal alignment, the mattress helps reduce pressure points, making it ideal for individuals with back or joint pain.
Comfort Specs
Visco-Elastic Memory Foam
This high density open-cell memory foam disperses heat more efficiently than previous generation memory foam. Cool-Sleep Airflow Layer
The upside-down egg carton-like design, built with temperature-regulation in mind, is a unique airflow system that encourages air to freely circulate thorough the mattress keeping you cool while you sleep.
The Silentnight Just Relax 3 Zone Mattress is designed to provide a balanced and comfortable sleeping experience. Its comfort specifications include: * Medium Firmness: This mattress offers a medium firmness level, catering to a wide range of sleepers by providing a harmonious blend of support and comfort. * Body-Moulding Memory Foam: The top layer consists of memory foam that contours to the body's shape, delivering personalized comfort and alleviating pressure points. * 3-Zone Miratex Support System: This innovative system offers targeted support to the shoulders, hips, and lower back, promoting proper spinal alignment and enhancing overall comfort. * Hypoallergenic Soft-Knit Fabric Cover: The mattress is encased in a soft-knit, hypoallergenic fabric, ensuring a clean and comfortable sleep surface suitable for allergy sufferers. These features collectively contribute to a restful and supportive sleep environment.
Support Specs
Visco-Elastic Memory Foam
A generous top layer of 9cm of true high-density visco-elastic memory foam provides supportive body-shaping performance. With billions of spherical shaped open cells, that intelligently respond under your weight to create the optimum level of body-cradling support to alleviate pressure points (such as the lower back, hips, shoulders). High-Resilience Foam Base
Nine centimetres deep, this high resilience impact-resistant foundation layer ensures perfectly weighted support for the upper layers. It provides class-leading performance and longevity.
Engineered to provide exceptional support through its innovative design: * 3-Zone Miratex Support System: This system delivers targeted cushioning to the shoulders, hips, and lower back, promoting proper spinal alignment and reducing pressure points for a more comfortable sleep. * Foam Support Core: The mattress features a robust foam support core that enhances overall stability and durability, ensuring consistent support across the entire sleep surface. These support specifications work in harmony to foster a restful and supportive sleeping environment.
Fabric Specs
Tencel® Outer Cover
This outer cover provides a luxurious, natural and breathable surface which can be removed and machine washed whenever you wish (machine wash at 30°C). Tencel® is naturally anti-bacterial, moisture-wicking, and sustainable. The breathability outperforms natural cotton and even the most hi-tech synthetics. It is also supremely strong and durable, yet luxuriously silky and soft to the touch. Vented 3D mesh panels at each end aid in preventing heat retention. Protective Inner Cover
This micro-fine inner cover protects all the foam layers.
Designed with a soft-knit hypoallergenic cover, this mattress is perfect for allergy sufferers. The materials are resistant to dust mites and other allergens, promoting a healthier sleep environment. Allergy UK approved.
Manufactured in
United Kingdom

Suitability

Side Sleepers
✓✓
Back Sleepers
✓✓

Size & Weight

UK Single
✓✓
UK Single Dimensions
190 x 90 x 23 cm190 x 90 x 18 cm
UK Single Weight (kg)
10.4
UK Double
✓✓
UK Double Dimensions
190 x 135 x 23 cm190 x 135 x 18 cm
UK Double Weight (kg)
16.2
UK King
✓✓
UK King Dimensions
200 x 150 x 23 cm200 x 150 x 18 cm
UK King Weight (kg)
19.1
UK Super King
✓✕
UK Super King Dimensions
200 x 180 x 23 cm✕
UK Super King Weight (kg)
✕

Delivery

Delivery Cost
FREEFREE
Delivery Info
Free next-day delivery for most customers (if ordered Monday to Thursday before 10am). Your mattress comes vacuum-packed, rolled and delivered right to your door in a convenient box. It comes with a 30-night no-obligation trial period and free returns if you decide it's not for you.
Delivery within 48 Hours (Mon-Fri, excl. Bank Holidays) by couriers, straight to your room of choice. It'll arrive rolled, so all you need to do is pop off the packaging, leave it to settle for 24hrs in a well ventilated room for optimum freshness and flatness, then give it a test drive.
Prices
Latest Promotions

Sale now on ! Up to 55% Off with code SAVE55. While stocks last.

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