Sienna Reflex Foam Mattress 4FT6 Double & 5FT King CoolBlue Memory Foam UK
4.8/5 – 12,618 Reviews
- 14-Day Returns (Standard Orders)
- Fast delivery 3-10 Days
- 24-Month Warranty Included
Description
The Sienna Reflex Foam Mattress is designed to deliver outstanding comfort, reliable support, and a cooler sleeping experience. Built with a 175mm high-density Reflex Foam base, 50mm CoolBlue Memory Foam, and a 25mm GelFlex comfort layer, this mattress combines firm body support with pressure-relieving comfort for a restful night’s sleep.
The supportive Reflex Foam base promotes healthy spinal alignment by evenly distributing body weight, while the CoolBlue Memory Foam contours to your body’s natural shape to relieve pressure points and reduce heat build-up. The additional GelFlex layer provides enhanced flexibility and responsive support, ensuring lasting comfort throughout the night.
Designed with temperature-sensitive technology, the Sienna Mattress adapts to your body while maintaining a cool and breathable sleeping surface. The hypoallergenic zipped cover creates a healthier sleep environment and can be removed easily for convenient cleaning, making it an excellent choice for allergy and asthma sufferers.
Ideal for master bedrooms, guest rooms, hotels, and rental properties, the Sienna Reflex Foam Mattress combines premium materials with advanced sleep technology to deliver long-lasting comfort and support.
Key Features
✔ Mattress Thickness: 8–10 Inch
✔ 175mm High-Density Reflex Foam Base
✔ 50mm CoolBlue Memory Foam Layer
✔ 25mm GelFlex Comfort Layer
✔ Temperature Sensitive Technology
✔ Pressure Relief & Orthopaedic Support
✔ Healthy Spinal Alignment
✔ Cool & Breathable Sleeping Surface
✔ Hypoallergenic Zipped Cover
✔ Durable Construction for Everyday Use
✔ Available in All UK Sizes
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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