Harbour Support Foam Extra Firm Mattress

• Made in the UK
• Extra-firm orthopaedic mattress with 20cm high-density reflex foam core
• Reflex foam for superior resilience and long-term support
• Completely silent all-foam construction - no springs, no noise
• CoolTouch quilted zip cover that's removable and washable
• Hypoallergenic throughout suitable for allergy-sensitive sleepers
• CertiPUR-US certified foam so no harmful chemicals
• BS 7177 UK fire safety compliant, vacuum-packed for simple delivery
  
• 5 Year Manufacturer Warranty
  
• Delivery Info
  

Maximum Support for Those Who Need It Most

Some sleepers simply can't get comfortable on a standard mattress. If you wake with back pain, have been recommended a firmer sleeping surface by a healthcare professional, or have found that conventional spring mattresses leave you feeling under-supported, the Harbour Extra Firm Mattress was made for you.

Its 20cm core of high-density reflex foam (Grade 40/300) delivers exceptional resilience holding its shape firmly beneath your body and maintaining proper spinal alignment throughout the night. This is a genuinely extra-firm mattress, not just marketed as one.

Why Grade 40/300 Reflex Foam Matters

Not all foam is equal. The Grade 40/300 specification means this reflex foam has a higher density and greater resistance to compression than standard foam used in mid-range mattresses. In practice, this translates to a mattress that distributes your body weight evenly across the full surface, reducing pressure on any single point while maintaining a firm, stable base that doesn't soften or sag over time. 

The all-foam construction has a further benefit: complete silence. There are no springs to creak or adjust, making the Harbour a particularly good choice for light sleepers or those who share a bed.

Practical Details That Make a Difference

The CoolTouch quilted zip cover adds a soft layer of surface comfort without undermining the firm feel beneath. It removes fully for machine washing, and the hypoallergenic treatment makes it a practical choice for those with dust mite sensitivities.

Manufactured in the UK to BS 7177 fire safety standards and CertiPUR-US certified, the Harbour arrives vacuum-packed and rolled, ready to use within hours of delivery.

Explore our firm mattress collection, or browse all options across our full mattress range.

Mattress Size Guide - Check Your Dimensions

	Height	Width	Depth
Small Single	20cm	75cm	190cm
Single	20cm	90cm	190cm
Small Double	20cm	120cm	190cm
Double	20cm	135cm	190cm
King	20cm	150cm	200cm
Super King	20cm	180cm	200cm

Density/Firmness Rating - What's Best For You?

Each type of mattress varies by comfort grade, from soft to firm. Our density ratings (provided by the manufacturer) are to be used as a guide. Every comfort grade has its advantages, and the right one for you depends on your personal preferences but also your favoured sleeping position.

The Harbour Support Foam Extra Firm Mattress is rated as Extra Firm

Soft	Offers the least resistance, providing a gentle support base, contouring to your natural body shape. Perfect for side sleepers.
Medium	Gentle support system, conforming to the shape of your body. Great if you sleep on your side or front.
Firm	Provides essential support to maintain natural spinal alignment. Ideal for back or front sleepers.
Extra Firm	Provides increased support to maintain natural spinal alignment. Ideal for back or front sleepers. This extra support helps your body maintain good posture and prevents your back from curving.

 

Guarantee

5-year manufacturer’s warranty. This is a sliding warranty where cover reduces over time. Full details available upon request.

Unboxing

• This mattresses is rolled and vacuum packed, so should be removed from the packaging as soon as possible after delivery
• Once unrolled, please allow up to 24 hours for the mattress to fully expand and recover to its intended shape and comfort level
• During the first few hours, the mattress may feel slightly firmer than expected – this will settle as it fully expands
• Some customers may notice a slight, harmless smell when first opening the mattress. This is known as off-gassing, which is normal for newly manufactured foam products. The smell is temporary and typically dissipates within a few hours to a couple of days. We recommend placing the mattress in a well-ventilated room during this time to help the process

Comparison Table

	Frostwell Cool Blue Foam	Keswick Ortho Memory	Northwick Cool Blue 2000	Ashbourne Memory 2000	Harbour Extra Firm	Meadow Eco Sprung
Depth	20cm	20cm	20cm	20cm	20cm	19cm
Firmness	Medium	Firm	Medium	Medium	Extra Firm	Medium
Construction	3-Layer Foam	3-Layer Foam	Pocket Spring + CoolBlue Foam	Pocket Spring + Memory Foam	Single-Layer Reflex Foam	Coil Spring + Eco Foam
Spring count	—	—	2,000	2,000	—	Coil spring
Cooling tech	✓	✗	✓	✗	✗	✗
Orthopaedic	✗	✓	✗	✗	✓	✗
Removable cover	✓	✓	✓	✓	✓	✓
Hypoallergenic	✓	✓	✓	✓	✓	✓
Warranty	5 yr sliding	5 yr sliding	5 yr sliding	5 yr sliding	5 yr sliding	5 yr sliding