Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
29
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
5
Price Range
£445 to £749
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.
This mattress sits in a sensible middle ground: natural fibres up top, a 1500 pocket spring core underneath, which means each spring responds to your body independently rather than the whole surface moving when your partner does. The cotton in the comfort layers helps wick away moisture, useful if you tend to sleep warm. It carries a 5 year guarantee and is made by a National Bed Federation Approved Brand, conforming to BS7177: 2008 for fire resistance. At £445 to £749 depending on size, it is honestly priced for a handcrafted UK pocket spring mattress. Mattress Online, the listing retailer, offers a 100-night trial, which takes some risk out of buying unseen.
Key Features & what's inside
- Cotton and Polyester Blend. Two layers blending cotton and polyester fibres, which means cushioned comfort where your body meets the mattress. The cotton wicks away moisture while the polyester increases airflow, helping you stay cooler through the night.
- Soft White Fibres. Two layers of soft white fibres that enhance breathability and add durability. In practice, this helps the mattress hold its shape rather than developing dips over time.
- Pocket Springs. 1500 responsive pocket springs, each sewn into its own fabric pocket before being bonded together, so they can move individually as well as working as a team. This means the springs follow your shape and limit motion transfer from a restless partner.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you like a soft, cradling feel, this medium to firm mattress will probably feel too solid, particularly for lightweight side sleepers. There is no memory foam layer, so those who enjoy a slow, contouring sink should look elsewhere. Anyone wanting a very deep, hotel-style mattress may find 29cm a little modest.
Wentworth Mercer Natural Pocket 1500 Mattress
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How firm is the Wentworth Mercer Natural Pocket 1500 mattress?
It is described as medium to firm on the product page. That means a supportive feel with some surface cushioning, which suits back and combination sleepers well, though it may feel a little firm for lightweight side sleepers.
Does the Wentworth Mercer Natural Pocket 1500 come with a trial?
Mattress Online lists a 100-night trial for this mattress. This is the retailer's own offer rather than a manufacturer promise, so if you buy elsewhere, check that retailer's returns terms before ordering.
How many springs does the Natural Pocket 1500 have?
It contains 1500 pocket springs, each enclosed in its own fabric pocket. They respond to pressure individually, which means better contouring to your body and less disturbance when a partner moves.
What guarantee does the Wentworth Mercer Natural Pocket 1500 have?
It comes with a 5 year guarantee, as listed by Mattress Online. Keep your proof of purchase, and check the retailer's terms for what the guarantee covers.
How deep is the Wentworth Mercer Natural Pocket 1500 mattress?
It is 29cm deep. Most standard fitted sheets will fit, but if yours are shallow, it is worth checking the measurements before it arrives.
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