King Size Memory Foam Mattresses - MattressOnline

Excellent

65,570reviews on

Delivery Information

The Sleep Journal

Menu

About Us Delivery Information Help Centre Advice Centre The Sleep Journal Contact Us

View all Mattresses

Need some help?

What Mattress Firmness Is Right for Me?The Best Mattress for Each Sleeping Position

Superking Mattress6' x 6'6" / 180cm x 200cm King Size Mattress5' x 6'6" / 150cm x 200cm Double Mattress4'6" x 6'3" / 135cm x 190cm Small Double Mattress4' x 6'3" / 120cm x 190cm Single Mattress3' x 6'3" / 90cm x 190cm Small Single Mattress2'6" x 6'3" / 75cm x 190cm European Size Mattresses All Mattresses

Pocket SprungIndividual, responsive springs Standard SprungA firmer spring system Memory FoamMoulds to your body shape HybridSprung support with foam comfort LatexNatural support & pressure relief Gel FoamDesigned for a cooler sleep Natural FillingsBreathable and premium comfort Orthopaedic Hypoallergenic Eco-friendly Vegan Pillow Top Zip & Link Rolled-up Next Day Mattresses All Mattresses

Extra Firm Firm Medium to Firm Medium Soft to Medium All Mattresses

Need some help?

Bed & Mattress Size Guide Bed Buying Guide

Superking6' x 6'6" / 180cm x 200cm King Size5' x 6'6" / 150cm x 200cm Double4'6" x 6'3" / 135cm x 190cm Small Double4' x 6'3" / 120cm x 190cm Single3' x 6'3" / 90cm x 190cm Single Short3' x 5'9" / 90cm x 175cm Small Single2'6" x 6'3" / 75cm x 190cm All Beds

Bed Frames Divan Beds Storage Beds Ottoman Beds Sofa Beds TV Beds Kids' Beds Next Day Beds Guest Beds Headboards All Beds

Silentnight Mattress Online Elle Decoration Novo Jay-Be Birlea Vogue LPD Flintshire Furniture Friendship Mill All Beds

Wooden Bed Frames Fabric Bed Frames Metal Bed Frames All Beds

View all Bedding

Need some help?

Pillow Buying Guide Duvet Buying Guide Which Mattress Topper Is Best?

Memory Foam Latex Natural Fillings Hollowfibre Foam Gel Foam Cooling Hypoallergenic View all Pillows

4.5 tog 6.7 tog 7.5 tog 10.5 tog 13.5 tog 15 tog View all Duvets

WaterproofProtection against spills and accidents HypoallergenicProtects against allergens and dust mites QuiltedA stylish and comforting finish CoolingProtection and cooling in one View all Mattress Protectors

Memory FoamComfort tailored to your body shape Gel FoamExtra pressure relief and cooling comfort Natural FiliingNaturally breathable with plush fillings HypoallergenicExtra comfort and allergy protection View all Mattress Toppers

Weighted BlanketsSoothing weight to promote relaxation Electric BlanketsKeep warm and cosy in the colder months View all Blankets

End of January Sale

Save up to 55% off RRP

Discounted end-of-range-products

View all Brands

Need some help?

What Mattress Firmness is Right for Me?Bed Buying Guide Pillow Buying Guide

Silentnight Sleepeezee Sealy Hypnos Harrison Spinks Millbrook Beds Emma TEMPUR Simba Relyon SleepSoul Wentworth Mercer Rest Assured Luna Mattress Online Elle Decoration All Brands

Superking Mattress6' x 6'6" / 180cm x 200cm King Size Mattress5' x 6'6" / 150cm x 200cm Double Mattress4'6" x 6'3" / 135cm x 190cm Small Double Mattress4' x 6'3" / 120cm x 190cm Single Mattress3' x 6'3" / 90cm x 190cm Small Single Mattress2'6" x 6'3" / 75cm x 190cm European Size Mattresses

Pocket SprungIndividual, responsive springs Standard SprungA firmer spring system Memory FoamMoulds to your body shape HybridSprung support with foam comfort LatexNatural support & pressure relief Gel FoamDesigned for a cooler sleep Natural FillingsBreathable and premium comfort

Orthopaedic Hypoallergenic Eco-friendly Vegan Pillow Top Zip & Link Rolled-up Next Day Mattresses

Shop by firmness

Extra Firm Firm Medium to Firm Medium Soft to Medium

Need help?|What Mattress Firmness Is Right for Me?The Best Mattress for Each Sleeping Position

Superking6' x 6'6" / 180cm x 200cm King Size5' x 6'6" / 150cm x 200cm Double4'6" x 6'3" / 135cm x 190cm Small Double4' x 6'3" / 120cm x 190cm Single3' x 6'3" / 90cm x 190cm Single Short3' x 5'9" / 90cm x 175cm Small Single2'6" x 6'3" / 75cm x 190cm

Bed Frames Divan Beds Storage Beds Ottoman Beds Sofa Beds TV Beds Kids' Beds Next Day Beds Guest Beds Headboards

Silentnight Mattress Online Elle Decoration Novo Jay-Be Birlea Vogue LPD Flintshire Furniture Friendship Mill

Shop by material

Wooden Bed Frames Fabric Bed Frames Metal Bed Frames

Need help?|Bed & Mattress Size Guide Bed Buying Guide

Memory Foam Latex Natural Fillings Hollowfibre Foam Gel Foam Cooling Hypoallergenic

4.5 tog 6.7 tog 7.5 tog 10.5 tog 13.5 tog 15 tog

Mattress Protectors

WaterproofProtection against spills and accidents HypoallergenicProtects against allergens and dust mites QuiltedA stylish and comforting finish CoolingProtection and cooling in one

Mattress Toppers

Memory FoamComfort tailored to your body shape Gel FoamExtra pressure relief and cooling comfort Natural FiliingNaturally breathable with plush fillings HypoallergenicExtra comfort and allergy protection

Weighted BlanketsSoothing weight to promote relaxation Electric BlanketsKeep warm and cosy in the colder months

Need help?|Pillow Buying Guide Duvet Buying Guide Which Mattress Topper Is Best?

End of January Sale

Save up to 55% off RRP

Discounted end-of-range-products

Need help?|What Mattress Firmness is Right for Me?Bed Buying Guide Pillow Buying Guide

Your Basket

Your basket is empty :(

Why not browse our product ranges?

Free delivery to most locations

Free 60-night mattress trial

Old mattress removal service

End of January Sale

10 days 13 hrs 55 mins 7 secs

Memory Foam Mattresses

Home
Mattresses
Memory Foam Mattresses
King Size Memory Foam Mattresses

41-60 of 79 products

41-60 of 79 products

41-60 of 79 products

Filters

1

King Size

Superking

(69)

6' x 6'6" | 180cm x 200cm

King Size

(79)

5' x 6'6" | 150cm x 200cm

Double

(80)

4'6" x 6'3" | 135cm x 190cm

Small Double

(54)

4' x 6'3" | 120cm x 190cm

Single

(73)

3' x 6'3" | 90cm x 190cm

Superking Zip and Link

(2)

6' x 6'6" | 180cm x 200cm

European King Size

(1)

5'3" x 6'6" | 160cm x 200cm

European Double

(2)

4'7" x 6'6" | 140cm x 200cm

European Single

(1)

3' x 6'6" | 90cm x 200cm

3-Seater Sofa Bed Mattress

(1)

2-Seater Sofa Bed Mattress

(1)

Firm

(15)

Medium to Firm

(27)

Medium

(28)

Soft to Medium

(9)

Memory Foam

(66)

Pocket Sprung

(53)

Orthopaedic

(6)

Standard Sprung

(12)

Latex

(2)

Natural Fillings

(2)

Gel Foam

(8)

Reflex Foam

(18)

Rolled Up

(37)

Single-Sided Mattress

(68)

Double-Sided Mattress

(4)

Hypoallergenic

(36)

Pillow Top

(8)

Luxury Mattress

(12)

Eco Friendly

(1)

Silentnight

(10)

Sleepeezee

(8)

Sealy

(9)

Emma

(8)

TEMPUR

(3)

Simba

(5)

Relyon

(3)

SleepSoul

(6)

Luna

(5)

Mattress Online

(3)

Horizon

(5)

Uno

(1)

Romantica

(1)

Bodyshape

(10)

Komfi

(2)

£200 - £300

(12)

£300 - £400

(6)

£400 - £500

(7)

£500 - £600

(11)

£600 - £700

(7)

£700 - £800

(5)

£800 - £900

(5)

£900 - £1000

(7)

£1000+

(19)

Sealy Posturepedic Elevate Premier Gel Mattress

Sealy Posturepedic Elevate Premier Gel Mattress

60-night comfort trial

Free delivery from tomorrow

King Size£1,367.00

Was £1,609.00

RRP £1,999.00

Horizon Discovery 2000 Pocket Memory Mattress

Horizon Discovery 2000 Pocket Memory Mattress

60-night comfort trial

Free delivery from tomorrow

King Size£509.00

RRP £865.00

Sleepeezee Memory Comfort 1000 Pocket Pillow Top Mattress

Sleepeezee Memory Comfort 1000 Pocket Pillow Top Mattress

60-night comfort trial

Free delivery from tomorrow

King Size£599.00

RRP £849.00

Emma Diamond Hybrid Mattress

Emma Diamond Hybrid Mattress

100-night comfort trial

Free delivery from tomorrow

King Size£1,109.00

RRP £1,619.00

Bodyshape Boost 1000 Pocket Memory Mattress

Bodyshape Boost 1000 Pocket Memory Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery from tomorrow

King Size£407.00

Was £479.00

RRP £640.00

Silentnight 1400 Pocket Memory Mattress

Silentnight 1400 Pocket Memory Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery from tomorrow

King Size£729.00

RRP £853.99

Extra 10% off today SN10

Komfi Unity Memory Deluxe Mattress

Komfi Unity Memory Deluxe Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery from tomorrow

King Size£212.95

RRP £270.00

Bodyshape Vitality Memory Foam Mattress

Bodyshape Vitality Memory Foam Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery from tomorrow

King Size£254.00

Was £299.00

RRP £350.00

Memory Zone 1000 Pocket Mattress Corner

Memory Zone 1000 Pocket Mattress

60-night comfort trial

Free delivery from tomorrow

King Size£419.95

RRP £609.00

Sleepeezee Luxury Ortho 1800 Pocket Memory Mattress

Sleepeezee Luxury Ortho 1800 Pocket Memory Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery from tomorrow

King Size£1,018.00

Was £1,199.00

RRP £1,499.00

Bodyshape Ortho Memory Foam Mattress

Bodyshape Ortho Memory Foam Mattress

60-night comfort trial

King Size£296.95

SleepSoul Space 3000 Pocket Memory Pillow Top Mattress

SleepSoul Space 3000 Pocket Memory Pillow Top Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery in 12-14 weeks

King Size£519.95

RRP £839.99

Simba Inter Comfort Hybrid 1500 Pocket Mattress

Simba Inter Comfort Hybrid 1500 Pocket Mattress

60-night comfort trial

Free delivery from tomorrow

King Size£674.25

RRP £899.00

Sleepeezee Luxury Cool 3000 Pocket Pillow Top Mattress

Sleepeezee Luxury Cool 3000 Pocket Pillow Top Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery from tomorrow

King Size£1,188.00

Was £1,399.00

RRP £1,749.00

Horizon Eclipse 3000 Pocket Memory Mattress

Horizon Eclipse 3000 Pocket Memory Mattress

60-night comfort trial

Free delivery in 16+ weeks

King Size£960.00

Horizon Juno 5000 Pocket Memory Mattress

Horizon Juno 5000 Pocket Memory Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

60-night comfort trial

Free delivery from tomorrow

King Size£799.00

RRP £1,250.00

Bodyshape Classic Memory Foam Mattress

Bodyshape Classic Memory Foam Mattress

60-night comfort trial

King Size£279.95

Simba Hybrid Luxe Mattress

Simba Hybrid Luxe Mattress

60-night comfort trial

Free delivery from tomorrow

King Size£1,394.25

Was £1,764.95

RRP £1,859.00

Emma Helix Hybrid Mattress

Emma Helix Hybrid Mattress

100-night comfort trial

Free delivery from tomorrow

King Size£1,029.00

RRP £1,499.00

The ONE by TEMPUR Soft

TEMPUR ONE Soft Mattress

60-night comfort trial

Free delivery from tomorrow

King Size£1,349.95

RRP £1,549.00

41-60 of 79 products

1

2

3

4

Sales Enquiries

Mon-Sat: 9:30am - 5:30pm

Sunday: 10am - 4pm

Customer Service

Mon-Sat: 9:30am - 5:30pm

Sunday: 10am - 4pm

customerservice@mattressonline.co.uk

Good Retail Sustainability Awards 2022

Proudly Supporting the Sleep Charity

Proudly Supporting Zarach

Visa Payments

Mastercard Payments

PayPal Payments

Apple Pay Payments

Google Pay Payments

Klarna Payments

Useful Links

Advice
Contact Us
Delivery
60-Night Mattress Comfort Trial
Mattress Recycling
Our Independent Reviews
Our Awards
The Sleep Journal
About Us
Careers
Press Enquiries
Visit Our Stores
Help Centre

Popular Categories

Sale
All Mattresses
Double Mattresses
King Size Mattresses
Single Mattresses
Pocket Sprung Mattresses
Memory Foam Mattresses
Orthopaedic Mattresses
Silentnight
Next Day Mattresses

© 2025 MattressOnline.co.uk Ltd|VAT Reg: 838851683|Terms & Conditions|Privacy Policy|Site Map

MattressOnline.co.uk Ltd is authorised and regulated by the Financial Conduct Authority (FCA FRN 923012) and acts as a credit intermediary and not a lender, offering credit products provided exclusively by Klarna Bank AB (publ). Finance is only available to permanent UK residents aged 18+, subject to status, terms and conditions apply.