Firm Mattresses
Firm mattresses offer solid, stable support - perfect for front and back sleepers. Find your open coil, memory foam or orthopaedic match today. Shop top UK brands like Silentnight and Sealy with free next day delivery and a 60-Night Comfort Trial.
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Sealy Harlow Ortho Plus Mattress
Was £314.95
RRP £419.00
SleepSoul Luna 1500 Ortho Pillow Top Mattress
Was £429.95
RRP £509.99
Silentnight Seoul Miracoil Memory Mattress
Was £269.95
RRP £352.00
Millbrook Wool Ortho 1000 Pocket Mattress
Was £369.95
RRP £620.91
Hypnos Hemsworth Support Mattress
Was £589.95
RRP £1,025.00
Silentnight UltraGel 1400 Mirapocket Mattress
Was £469.95
RRP £589.00
Relyon Rufford Memory 1500 Pocket Mattress
Was £676.00
RRP £966.00
Copper Fresh Envy Supreme Mattress
Was £569.95
RRP £799.00
Wentworth Mercer Natural Pocket 2000 Mattress
Was £499.95
RRP £680.00
Millbrook Wool Ortho 1000 Pillow Top Mattress
Was £399.95
RRP £629.37
Silentnight UltraGel Cool-to-Touch 3000 Mirapocket Firmer Mattress
Was £719.95
RRP £879.00
Silentnight Rio Miracoil Cushion Top Mattress
RRP £319.00
Mlily Bamboo+ Superb Ortho Memory 2500 Pocket Mattress
RRP £685.00
Relyon Orthofirm Deluxe 800 Pocket Mattress
RRP £621.00
Silentnight Healthy Growth Sleepy Eco Mattress
RRP £199.00
KomfiMed Ortho Firm Mattress
RRP £775.00
Silentnight Eco Comfort Airmesh 2000 Pillow Top Mattress
RRP £569.00
Sealy Eaglesfield Memory Ortho Plus Mattress
RRP £549.00
Silentnight Healthy Growth Lunar Eco Memory Mattress
RRP £299.00
Sealy Ortho Plus Maxwell Mattress
RRP £699.00
How does a firm mattress feel?
Our firm mattresses provide a solid sleep surface with minimal give. They feel supportive and stable - ideal if you prefer a hard sleep surface.
Is a firm mattress good for your back?
Yes - firm mattresses can support better spinal alignment, especially for back sleepers. They help distribute weight evenly across your shoulders, hips, and lower back for a healthier sleep posture.
Not sure if a firm mattress is best for your body type? Our mattress firmness guide has more information.
What size firm mattresses are available?
We stock hard mattresses in all standard sizes:
- Small single - 75cm x 190cm
- Single - 90cm x 190cm
- Small double - 120cm x 190cm
- Double - 135cm x 190cm
- King size - 150cm x 200cm
- Superking - 180cm x 200cm
Our firm mattress also come in specialist sizes, too:
- Small single short - 75cm x 175cm
- Single short - 90cm x 175cm
- European double - 140cm x 200cm
- European king size - 160cm x 200cm
- Superking zip and link - 180cm x 200cm
- Emperor - 200cm x 200cm
Do your firm mattresses come with a warranty?
Yes, all our firm mattresses come with a minimum 1-year warranty. Some models include up to 10 years of cover, depending on the brand.
You’ll also get our free 60-Night Comfort Trial, so you can try your new mattress risk-free.
Advice and Buying Guides
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Why buy from Mattress Online?
Free delivery to most locations
Free next working day delivery on most of our mattresses and beds, or upgrade to weekend delivery.
Free 60-night mattress comfort trial
Test your mattress for 60 nights and if you don't like it, simply swap it.
Old mattress disposal
We can collect and recycle your mattress - saving it from landfill.
Sales Enquiries
Mon-Sat: 9:30am - 5:30pm
Sunday: 10am - 4pm
Customer Service
Mon-Sat: 9:30am - 5:30pm
Sunday: Closed
