Skip to content

By Type
By Firmness
By Size
- Size
  
  Single Mattresses
  Double Mattresses
  King Mattresses
  Small Double Mattresses
  Super King Mattresses

By Type
By Firmness
By Size
- Size
  Single Mattresses
  Double Mattresses
  King Mattresses
  Small Double Mattresses
  Super King Mattresses

Search

Item added to your cart

View cart

Free Express Delivery

10,000+ happy customers

Relax 30 night sleep trial

Free Express Delivery

10,000+ happy customers

Relax 30 night- sleep trial

Collection: Medium Firm

Sort by:

26 products

Filter:

Availability (0)

Availability

In stock (26 products)
Out of stock (0 products)

Price

The highest price is £2,839.99

£

From

To

Size (0)

Size

Single (26 products)
Double (26 products)
King (26 products)
Small Double (26 products)
Super King (26 products)

Firmness (0)

Firmness

Firm (2 products)
Medium (1 product)
Medium firm (26 products)

Filter and sort Filter

Filter and sort

Filter

26 products

Availability

In stock (26 products)
Out of stock (0 products)

Clear

Price

The highest price is £2,839.99

£

From

£

To

Clear

Size

Single (26 products)
Double (26 products)
King (26 products)
Small Double (26 products)
Super King (26 products)

Clear

Firmness

Firm (2 products)
Medium (1 products)
Medium firm (26 products)

Clear

Sort by:

Remove all

26 products

One-Third OrthoSync 3750 Pocket Ortho Mattress

Sale

Medium firm , Firm
One-Third OrthoSync 3750 Pocket Ortho Mattress

Regular price From £679.99 GBP

Regular price ~~£759.99 GBP~~ Sale price From £679.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird 1000 Pocket Ortho Mattress

Sale

Medium firm
OneThird 1000 Pocket Ortho Mattress

Regular price From £269.99 GBP

Regular price ~~£359.99 GBP~~ Sale price From £269.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
SilentPocket 1200 Arthur Mattress

Sale

Medium firm
SilentPocket 1200 Arthur Mattress

Regular price From £399.99 GBP

Regular price ~~£459.99 GBP~~ Sale price From £399.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird Elite Deluxe Mattress Pocket Sprung

Sale

Medium firm
OneThird Elite Deluxe Mattress Pocket Sprung

Regular price From £359.99 GBP

Regular price ~~£459.99 GBP~~ Sale price From £359.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird 800 Pocket Memory Mattress

Sale

Medium , Medium firm
OneThird 800 Pocket Memory Mattress

Regular price From £189.99 GBP

Regular price ~~£259.99 GBP~~ Sale price From £189.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird Luxury 4000 Pocket Mattress

Sale

Medium firm
OneThird Luxury 4000 Pocket Mattress

Regular price From £499.99 GBP

Regular price ~~£559.99 GBP~~ Sale price From £499.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
CoolFlux Gel Memory 1000 Mattress

Sale

Medium firm , Firm
CoolFlux Gel Memory 1000 Mattress

Regular price From £409.99 GBP

Regular price ~~£559.99 GBP~~ Sale price From £409.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
CoolFlux Memory Pocket 2000 Mattress

Sale

Medium firm
CoolFlux Memory Pocket 2000 Mattress

Regular price From £299.99 GBP

Regular price ~~£359.99 GBP~~ Sale price From £299.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird® Hybrid Luxe Mattress - Soft

Sale

Medium firm
OneThird® Hybrid Luxe Mattress - Soft

Regular price From £999.99 GBP

Regular price ~~£1,059.99 GBP~~ Sale price From £999.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird® Hybrid Luxe Mattress - Medium

Sale

Medium firm
OneThird® Hybrid Luxe Mattress - Medium

Regular price From £899.99 GBP

Regular price ~~£999.99 GBP~~ Sale price From £899.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
Essentials Memory Ortho Ecofoam Mattress

Sale

Medium firm
Essentials Memory Ortho Ecofoam Mattress

Regular price From £149.99 GBP

Regular price ~~£239.99 GBP~~ Sale price From £149.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
Sleeping Beauty 800 Pocket Memory Mattress

Sale

Medium firm
Sleeping Beauty 800 Pocket Memory Mattress

Regular price From £189.99 GBP

Regular price ~~£230.00 GBP~~ Sale price From £189.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
CoolFlux Memory Pocket 1000 Mattress

Sale

Medium firm
CoolFlux Memory Pocket 1000 Mattress

Regular price From £279.99 GBP

Regular price ~~£350.00 GBP~~ Sale price From £279.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird 2000 Pocket Memory Pillow Top Mattress

Sale

Medium firm
OneThird 2000 Pocket Memory Pillow Top Mattress

Regular price From £1,449.99 GBP

Regular price ~~£1,550.00 GBP~~ Sale price From £1,449.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird 2000 Pocket Pillow Top Mattress

Sale

Medium firm
OneThird 2000 Pocket Pillow Top Mattress

Regular price From £429.99 GBP

Regular price ~~£559.99 GBP~~ Sale price From £429.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale
OneThird Luxury 1500 Pocket Pillow Top Mattress

Sale

Medium firm
OneThird Luxury 1500 Pocket Pillow Top Mattress

Regular price From £429.99 GBP

Regular price ~~£559.99 GBP~~ Sale price From £429.99 GBP

In stock - Free delivery from Friday

30 Night Sleep Trial

Black Friday Sale

Sale

1
2

Contact Us

Request a callback
📧 Info@one-third.co.uk
📍 Unit 2 Day Street, Dewsbury WF13 3LJ
⏰ Mon – Frit: 9:00 AM – 5:00 PM

Help

Delivery
Privacy Policy
Shipping Policy
Contact

Payment methods

© 2026, One Third Powered by Shopify

Privacy policy
Shipping policy

Choosing a selection results in a full page refresh.
Opens in a new window.