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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Silentnight Rio Miracoil Cushion Top Mattress
Was £244.95
RRP £319.00
Mlily Bamboo+ Superb Ortho Memory 2500 Pocket Mattress
Was £344.95
RRP £685.00
Relyon Orthofirm Deluxe 800 Pocket Mattress
Was £435.00
RRP £621.00
Silentnight Healthy Growth Sleepy Eco Mattress
Was £189.95
RRP £199.00
KomfiMed Ortho Firm Mattress
Was £509.95
RRP £775.00
Silentnight Eco Comfort Airmesh 2000 Pillow Top Mattress
Was £524.95
RRP £569.00
Sealy Eaglesfield Memory Ortho Plus Mattress
Was £374.95
RRP £549.00
Silentnight Healthy Growth Lunar Eco Memory Mattress
Was £254.95
RRP £299.00
Sealy Ortho Plus Maxwell Mattress
RRP £699.00
Sealy Posturepedic Elevate Blackwood Mattress
RRP £1,299.00
Hypnos Hemsworth Support Mattress
RRP £1,025.00
Relyon Isabelle 2000 Pocket Mattress
RRP £717.00
Hypnos Marlow Ortho Deluxe Mattress
RRP £1,645.00
Silentnight Athens 1400 Mirapocket Ortho Mattress
RRP £407.00
SleepSoul Space 4000 Pocket Orthopaedic Gel Mattress
RRP £899.99
Harrison Spinks Quilted Fusion 4000 Pocket Mattress
RRP £1,169.00
Relyon Leano Wool 1000 Pocket Mattress
RRP £481.00
Sleepeezee Luxury 1400 Pocket Mattress
Millbrook Wool Ortho 1000 Pillow Top Mattress
RRP £629.37
Romantica Serenade Ortho Mattress
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
See what our customers say about us
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
