We value your privacy

Our website uses cookies to enhance your experience, serve personalized ads and analyze our traffic. To learn more, see our Cookie Policy

100 Night Sleep Trial on ALL mattresses!

Lowest Price Promise

100 Night Sleep Trial

Free next day delivery

Old mattress removal

0% Buy now, pay later

Sales Hotline: 0333 0069 769

Order by 6pm for next day delivery¹

100 Night Sleep Trial

Old mattress removal

0% Buy now, pay later

Saved

Basket

Search for items, brands and advice

Recent Searches

Suggestions

Top Categories

Top Products

More images

Description

Ready to take your mattress to the next level? Whether you are a naturally warm sleeper or simply love a cool, fresh-feeling bed, the Coolflex® Cool Gel Memory Foam Mattress Topper lets you enjoy a more refreshing, comfortable night's sleep.

Cooling gel beads draw heat away from your body

A 4cm deep layer of cooling gel memory foam uses millions of tiny gel beads to actively draw excess heat away from your body. Your body's core temperature naturally drops as you enter a deep sleep state; this cooling sensation encourages your body to reach this stage efficiently, resulting in a longer, deeper sleep. This cool gel foam prevents overheating and wicks away moisture, ensuring you enjoy an undisturbed night of restful sleep. Mesh borders also encourage maximum airflow for an even fresher feel.

Expert-designed comfort and gentle full-body cushioning

The memory foam construction of this specialist cooling foam means this mattress topper adapts to your body shape, providing personalised pressure relief as it moulds to your curves. Applying gentle support to every inch of your body, you can easily adjust the firmness of your current mattress with the Coolflex® Cool Gel Memory Foam Mattress Topper.

Fresh, clean, and naturally hypoallergenic

Naturally hypoallergenic and resistant to dust mites and allergens, this topper is essential for creating a more hygienic sleeping environment. You can even easily remove the soft-touch knitted cover and machine wash it at a cool 30°C to ensure maximum freshness. An anti-slip base and four elasticated corner straps anchor the topper securely to your mattress so that you can enjoy night after night of rejuvenating sleep.

1278735-5063475056793

Features

Machine Washable Knitted Cover

With a soft-touch knitted fabric, this cover is kind to your skin and easily removable with a discreet zip. Wash at a cool 30°C for ultimate convenience.

Cool Gel Memory Foam

This specialist foam is infused with millions of tiny cool gel beads that actively draw heat away from your body, resulting in a cooler, fresher sleeping environment.

4cm Depth

This topper is approximately 4cm deep.

Elasticated Corner Straps

These convenient straps secure the topper to your mattress, meaning you can change position comfortably without worrying about it moving with you.

Pressure Relieving

Maximum pressure relief, allowing your weight to spread evenly.

Hypoallergenic

Being hypoallergenic, this is the perfect item for allergy sufferers - or anyone looking for a healthy night's sleep.

Vegan Friendly

Made entirely without animal products or by-products.

Breathable Mesh Border

This cleverly designed border allows maximum airflow throughout the topper, helping to keep your sleeping environment as fresh and hygienic as possible.

Anti-Slip Fabric Base

This specially designed base keeps the topper securely in place throughout the night, preventing it from bunching up as you move for consistent comfort and support.

Rolled & Vacuum Packed

For your total convenience, this topper arrives rolled and vacuum-packed so you can easily transport it to your bedroom. Simply unroll and let it expand for a quick setup!

Fire Resistant - Low Hazard

This product conforms to the BS7177: 2008 standard for domestic use (low hazard) - ideal for use at home.

Benefits

Cooling gel beads draw heat away from your body for an all-night-long cooling sensation
Hypoallergenic and dust mite resistant for a fresher, hygienic night’s sleep
Improved airflow keeps things feeling as fresh as possible and further prevents overheating
Anti-slip fabric base plus four elasticated corner straps keeps the topper securely in place
Ideal for refreshing an older mattress or adding comfort to a firmer bed
The soft knitted cover is easily removed and machine washed at a cool 30°C

You've got the best price

As Online Bed Retailer of the Year 2025 - 2026, you can trust us to get you the best price. With our fast delivery and exceptional service, you won't find better elsewhere.

Coolflex® Cool Gel Memory Foam Mattress Topper

4.9 out of 5

5 Star (16)

4 Star (0)

3 Star (1)

2 Star (0)

1 Star (0)

Experience deep, refreshing sleep with cooling comfort that fights night sweats.

Machine Washable Knitted Cover

Cool Gel Memory Foam

4cm Depth

£79

RRP £119

Save £40

Hurry, this offer ends in 0 days 0hrs 0mins

from £79

Size

Single 3' x 6'3"

£79 RRP £119

In stock

Small Double 4' x 6'3"

£99 RRP £149

In stock

Double 4'6" x 6'3"

£99 RRP £149

In stock

King Size 5' x 6'6"

£129 RRP £199

In stock

Super King 6' x 6'6"

£149 RRP £229

In stock

FREE Delivery within Next Day Estimated delivery from

FREE delivery Tomorrow, 13th June
Order within hrs mins secs

This product combination is unavailable.

Out of stock

Simply pop your email address below, and we'll send you a quick reminder when this item is available!

Please enter a valid email.

Keep an eye on your inbox. We'll let you know when this item is back in stock.

Something went wrong, please try again.

Description & Features

Cooling gel beads draw heat away from your body

Expert-designed comfort and gentle full-body cushioning

Fresh, clean, and naturally hypoallergenic

Machine Washable Knitted Cover

With a soft-touch knitted fabric, this cover is kind to your skin and easily removable with a discreet zip. Wash at a cool 30°C for ultimate convenience.

Cool Gel Memory Foam

This specialist foam is infused with millions of tiny cool gel beads that actively draw heat away from your body, resulting in a cooler, fresher sleeping environment.

4cm Depth

This topper is approximately 4cm deep.

Elasticated Corner Straps

These convenient straps secure the topper to your mattress, meaning you can change position comfortably without worrying about it moving with you.

Pressure Relieving

Maximum pressure relief, allowing your weight to spread evenly.

Hypoallergenic

Being hypoallergenic, this is the perfect item for allergy sufferers - or anyone looking for a healthy night's sleep.

Vegan Friendly

Made entirely without animal products or by-products.

Breathable Mesh Border

This cleverly designed border allows maximum airflow throughout the topper, helping to keep your sleeping environment as fresh and hygienic as possible.

Anti-Slip Fabric Base

This specially designed base keeps the topper securely in place throughout the night, preventing it from bunching up as you move for consistent comfort and support.

Rolled & Vacuum Packed

For your total convenience, this topper arrives rolled and vacuum-packed so you can easily transport it to your bedroom. Simply unroll and let it expand for a quick setup!

Fire Resistant - Low Hazard

This product conforms to the BS7177: 2008 standard for domestic use (low hazard) - ideal for use at home.

Cooling gel beads draw heat away from your body for an all-night-long cooling sensation
Hypoallergenic and dust mite resistant for a fresher, hygienic night’s sleep
Improved airflow keeps things feeling as fresh as possible and further prevents overheating
Anti-slip fabric base plus four elasticated corner straps keeps the topper securely in place
Ideal for refreshing an older mattress or adding comfort to a firmer bed
The soft knitted cover is easily removed and machine washed at a cool 30°C

1278735-5063475056793

Coolflex® 5 Year Guarantee

Coolflex® 5 Year Guarantee

Coolflex® mattresses are made with the most meticulous of care, but in the very unlikely event that something should go wrong as a result of faulty material or craftsmanship, you're covered by a generous 5 year guarantee.

Download warranty/guarantee information

Delivery & Returns

Delivering a better night’s sleep

We are proud to provide our award-winning Free Next Day Delivery service to almost everywhere across mainland UK, sending a proper night’s sleep out far and wide.

Hassle-free and convenient, you can choose a date and time that suits you if you prefer, and get us to deliver straight to your room of choice!

For some addresses, a small fee will be charged to help us get you your best night’s rest as quickly as possible. To see if this applies to you, or if we’d be unable to deliver to you, just check our Postcode Checker.

Returns made simple

Sleep is personal, so we understand that sometimes you may want to return an item you’ve purchased from us for an exchange or refund.

To make things go as smoothly as possible if you do decide to return, make sure that you check your item(s) when they arrive before signing for delivery.

In the unlikely event of a problem, just give our friendly, award-winning Customer Service team a call, but do note that if you want to return your item to us, you will be responsible for arranging it and for the cost. For more information, head to our Returns page.

Recycling & Sustainability

Old Mattress Removal

For just £39, our fast and friendly team will collect your old mattress at the exact same time we deliver your new one. No waiting, no heavy lifting, and no clutter. 100% of your old mattress is carefully recycled and kept out of landfill. Simply select 'Old Mattress Removal' at checkout.

Our Sustainability Efforts

We’re proud to be partnered with Ecologi, the UK’s leading climate platform, to help us plant trees and fund environmental projects across the globe, protecting the world’s rainforests and helping those in need.

Our #SustainableSnooze campaign also highlights our journey to becoming a Net Zero company, keeping as many old mattresses out of landfill, and making positive steps in our internal processes to become as green as possible.

Read more about why this is important to us and the milestones we’ve achieved on our Sustainability page.

Frequently paired with

More from Coolflex®

More to explore

Coolflex® Black Friday Mattress Deals Bedding & Bed Linen

Your order helps us plant trees

151,970+ Trees planted so far

Free, fast delivery

Award winning delivery

Mattress recycling

Planet-friendly disposals

0% Interest finance

Buy now, pay later with Klarna

18+, T&Cs apply, Credit subject to status

Coolflex® Cool Gel Memory Foam Mattress Topper

£

View basket

Pair it with

I'm on Sale

Jasmine Traditionally Sprung Mattress

4.5 (128)

From £139

I'm on Sale

Coolflex® Cool Gel Memory Foam Pillow

4.6 (28)

£39 £69 You save £30

I'm on Sale

Silentnight Supersoft Fitted Sheet - White

4.8 (12)

From £8

I'm on Sale

DreamEasy Luxury Quilted Mattress Protector

4.8 (172)

From £12

Terms & Conditions Privacy Policy Cookie Policy Sitemap

*Delivery charges may apply for some areas. Please see our delivery page for more information.
1. Order by 6pm for next day delivery between Monday-Friday, 12pm on Saturday and 3pm on Sunday. The 'Order by' time may be subject to change dependant on our delivery partners.

Bedsonline.biz Ltd is authorised and regulated by the Financial Conduct Authority (FCA FRN 710091) and acts as a credit intermediary and not a lender, offering credit products provided exclusively by Klarna Financial Services UK Ltd (publ). Finance is only available to permanent UK residents aged 18+, subject to status, terms and conditions apply.

MattressNextDay, 116 Joseph Wilson Industrial Estate, Whitstable, Kent, CT5 3SN

We value your privacy

Coolflex® Cool Gel Memory Foam Mattress Topper

Delivering a better night’s sleep

Returns made simple

Old Mattress Removal

Our Sustainability Efforts

Rated Excellent

Frequently paired with

More from Coolflex®

You might also like

More to explore

Your order helps us plant trees

Free, fast delivery

Mattress recycling

0% Interest finance

Coolflex® Cool Gel Memory Foam Mattress Topper

£

Pair it with