Very Firm Orthopaedic Foam Mattress UK

Deep Support with High Density Blue Foam Comfort

Stable Body Support for Side & Back Sleepers

The Rock Very Firm Blue Foam Mattress by Sleep Heaven offers exceptional orthopaedic support with a high‑density foam core designed for deep, firm comfort and spinal alignment throughout the night. This solid foam mattress delivers edge‑to‑edge stability and minimises aches and pains, making it ideal for sleepers who prefer minimal give and maximum reinforcement. 

At approximately 20 cm in depth, the mattress for lower-profile beds is wrapped in a luxury 4‑way knitted stretch fabric that enhances breathability and gives your bedroom a refined look. Regular rotation is recommended to maintain mattress performance over time. 

Flag‑stitched handles make handling and positioning easier, and all materials are brand-new and conform to British Fire Safety Regulations (BS 7177:2008), ensuring safety and quality you can trust in UK homes. 

It also has flag-stitched handles, which are not shown in the photograph.

Mattress thickness 20cm.
Firmness Rating: Very Firm
The fabric's colour may vary over time, but the material's quality may not remain the same.
All our Products are Brand New and Conform to British Fire Regulations- BS 7177: 2008

The fabric's colour may change over time, due to the manufacturer's supply, but the actual quality will remain the same.

Overall dimensions:​

Small Single: 2ft 6” x 6ft 3” / 75cm x 190cm
Single: 3ft x 6ft 3” /90cm x 190cm
Small Double: 4ft x 6ft 3” / 120cm x 190cm
Standard Double: 4ft 6”x 6ft 3” / 135cm x 190cmKing Size: 5ft x 6ft 6”/ 150cm x 200cm
King Size: 5ft x 6ft 6”/ 150cm x 200cm
Super King: 6ft x 6ft 6" /180cm x 200cm

It is also available as a 25cm thick mattress.

Please view other Mattresses from Sleep Heaven.

Please view our Mattress Range.

Frequently Asked Questions

What firmness is the Rock mattress?

The Rock Very Firm Blue Foam Mattress has a very firm, orthopaedic feel designed for deep support and spinal alignment.

What type of foam is used?

It features a high‑density foam core, providing edge‑to‑edge support without springs, while the stretch fabric cover keeps it breathable. 

Is this mattress suitable for back pain?

Yes — very firm support can help maintain correct spinal posture and alleviate discomfort for back and side sleepers.

How thick is the mattress?

This model is available in a 20 cm profile, with a deeper Rock 25 cm mattress option also offered on the Bedz4u site.

Does the mattress conform to UK safety standards?

Yes — all Bedz4u products, including this mattress, comply with British Fire Safety Regulations (BS 7177:2008). 

How should I care for this mattress?

This UK mattress is double‑sided and turnable. Rotating and flipping it regularly (using the built‑in handles) helps distribute wear evenly and extend the mattress's lifespan.