Firmness
Medium Soft
Type
Pocket Spring
Depth (cm)
29
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
5
Price Range
£769 to £1,399
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
The appeal here is natural fillings at a mid-range price. Wool and cotton layers regulate temperature and wick moisture, which means you're less likely to overheat in summer or feel clammy overnight. Underneath, 5000 pocket springs move independently, so you'll feel less disturbance when a partner shifts position. It carries National Bed Federation approval and is handcrafted in the UK, which offers some reassurance on build quality. The soft to medium feel is genuinely on the gentler side, lovely if you sleep on your side, less ideal if you need firm support. Yes, it's currently stocked by just one retailer, but Mattress Online's listed terms include free delivery to most locations and a 100-night trial, protector purchase required.
Key Features & what's inside
- Wool. Natural wool fibres with temperature regulating properties, which means the mattress helps you stay cool in summer and warm in winter. Wool is a genuinely useful top layer for anyone who runs hot at night.
- Cotton. Natural cotton fibres keep the sleeping surface fresh, regulating body temperature and wicking away moisture. In practice, this means a drier, more breathable feel than all-synthetic comfort layers.
- Soft White Fibres. Soft synthetic fillings that create a cosy, cushioned feel. They're durable and resilient, so the layer should hold its shape rather than flattening quickly.
- Pocket Springs Support System. 5000 pocket springs made from twice tempered steel, each encased in its own fabric pocket so it moves independently. That means support that follows your body's shape, with less motion transfer across the bed.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a firm surface, or you're a heavier back or front sleeper who needs more pushback, the soft to medium feel here will likely feel too yielding. It's also stocked by one retailer, so you can't shop around, and the listed trial depends on buying a protector from Mattress Online.
Wentworth Mercer Deluxe Naturals 5000 Pocket Mattress
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How firm is the Wentworth Mercer Deluxe Naturals 5000?
It's described as soft to medium, so it sits on the gentler side of the scale. That cushioned feel suits side sleepers and lighter bodies well, but if you sleep on your front or need firmer spinal support, you may find it a little too soft.
Does the Deluxe Naturals 5000 come with a trial period?
Mattress Online lists a 100-night trial with this mattress, but it requires purchasing a mattress protector from them at the same time. This is the retailer's own offer rather than a brand-wide policy, so check the terms carefully before you buy.
What is the Deluxe Naturals 5000 made of?
It combines natural wool and cotton layers with soft white synthetic fibres over 5000 pocket springs made from twice tempered steel. The mattress is 29cm deep, handcrafted in the UK, and Wentworth Mercer is a National Bed Federation approved brand.
What guarantee does the Wentworth Mercer Deluxe Naturals 5000 have?
Mattress Online lists a 5-year guarantee, and its page also mentions an additional 5-year warranty on top of that. These are the retailer's stated terms, so confirm the details with them directly before ordering.
What sizes does the Deluxe Naturals 5000 come in?
Five UK sizes: Single, Small Double, Double, King and Super King, priced from £769 to £1,399. Mattress Online lists free delivery to most locations, with next day weekday delivery available, room-of-choice delivery for £20.00 and old mattress removal for £35.00.
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