Cobalt Serenity Reflex Memory Mattress Orthopaedic Comfort 4FT6 5FT 6FT UK Bed Mattress
4.8/5 – 12,618 Reviews
- 14-Day Returns (Standard Orders)
- Fast delivery 3-10 Days
- 24-Month Warranty Included
The Cobalt Serenity Reflex Memory Mattress is designed to provide outstanding comfort and reliable support for a restful night’s sleep. Combining quality reflex foam with memory foam comfort layers, this mattress contours to your body to help reduce pressure points while promoting healthy spinal alignment.
Its supportive design delivers a comfortable sleeping surface suitable for everyday use, making it an excellent choice for bedrooms, guest rooms, and rental properties. The breathable construction helps improve airflow, while the durable materials ensure long-lasting performance and comfort.
Whether you are replacing an old mattress or upgrading your bedroom, the Cobalt Serenity Reflex Memory Mattress offers the perfect balance of support, comfort, and durability. Available in a range of UK sizes to suit your needs.
Key Features
✔ Premium Reflex & Memory Foam Construction
✔ Comfortable Orthopaedic Support
✔ Pressure-Relieving Sleep Surface
✔ Breathable & Durable Design
✔ Suitable for Everyday Use
✔ Long-Lasting Comfort
✔ Available in Single, Small Double, Double, King & Super King
✔ Ideal for Homes, Guest Rooms & Rental Properties
✔ Mattress Thickness: 8 to 10 Inch
✔ Support: Orthopaedic
Mattress Sizes
Single (3FT): 90 × 190 cm
Small Double (4FT): 120 × 190 cm
Double (4FT6): 135 × 190 cm
King (5FT): 150 × 200 cm
Super King (6FT): 180 × 200 cm
| Size | 3FT Single, 4FT Small Double, 4FT6 Double, 5FT Kingsize, 6FT Super Kingsize |
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Yes. All our beds and mattresses come with 5 Year Warranty & 60 Night Trial. If you’re not happy with your product, feel free to contact us via our helpdesk.
Your bed will be delivered within 5-7 working days. You will receive a text and email with a tracking link which contains the delivery date and time slot. This will be sent to you several days before the delivery.
We can’t guarantee a delivery date, however we will try our best to arrange a delivery around your schedule. Once you have placed your order, you can get in touch with us via our helpdesk to let us know your delivery preference.
Small single or single divan bases will arrive as one whole unit.
Small double, double, king & super king divan bases will arrive in two halves to make it easy and convenient to move around your home.
The headboard is delivered as a separate piece and must be attached when assembling the bed.
Yes. The bed will be without a mattress unless you select one of our handpicked best sellers as a bundle to get an even bigger saving. You can do this by selecting a mattress above.
Yes. We provide you with everything you need to assemble the bed. The only tool you need is a screwdriver.
Very easy! We know you don’t want to spend all day fiddling around with tools, so we provide everything you need to put your bed together in five minutes or less.
Yes! You get a free headboard with your bed in the same stunning design as the one pictured in the image above.
You can select the side of the drawers from the product selection above.
You can see the dimensions above.
Yes. Your safety is of the utmost importance to us and we ensure all our products conform to UK fire and safety regulations.

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