Harrison Spinks Platinum 12500 Pocket Mattress (Firmer Feel)

Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.

This mattress suits you if you want natural materials rather than foam. The wool fillings regulate temperature, which means you're less likely to overheat in summer or feel chilly in winter, and the hemp and flax fibres are there for durability rather than show. The three-tier spring system, 10,500 mini springs plus 1,000 Posturfil and 1,000 Cortec Quad Revolution springs, adapts to your body weight and movement, so you get contouring without the sink of memory foam. It conforms to BS7177: 2008 for home use and Harrison Spinks is a National Bed Federation Approved Brand. Yes, it costs more than most entry-level pocket sprung options, but the spring count, natural fillings and UK handcrafting go some way to justifying it.

Warm sleepers
Layers of British wool at the top regulate temperature naturally, which means you're less likely to overheat in summer or feel chilly in winter.

Eco-conscious buyers
Comfort fillings of British wool, cotton, hemp and flax, plus a recycled Ecotex fibre layer, mean you get natural materials rather than foam.

Side sleepers
A soft to medium feel with 10,500 mini springs moving independently lets the surface contour to your shoulders and hips as you lie on your side.

Combination sleepers
The 1,000 Posturfil springs respond to your movements and weight distribution, which means flexible support that adjusts as you change position through the night.

Couples
Each spring in the three-tier system moves independently, so the surface adapts to two different body shapes and weights while you both move around.

If you genuinely want a firm mattress, be careful: despite the name, this specific model is listed with a soft to medium feel. Heavier sleepers who need a firmer surface may find it too yielding. It's also a poor fit for tight budgets, and anyone wanting fast delivery may find the timescale slow.

How firm is the Harrison Spinks Platinum 12500?

Despite 'Firmer Feel' appearing in the product name, the MattressOnline listing rates this version as a soft to medium feel. The model is also listed as available in medium and firm versions, so check you're ordering the tension you actually want before you buy.

How many springs does the Platinum 12500 have?

12,500 in total, split across three layers: 10,500 mini pocket springs for contouring, 1,000 Posturfil springs that respond to your movement and weight, and 1,000 Cortec Quad Revolution springs at the base, each with a mini spring inside it for two-stage support.

Does the Harrison Spinks Platinum 12500 come with a trial and guarantee?

MattressOnline lists a 100-night trial with this mattress, though that's the retailer's own offer rather than a Harrison Spinks promise, so terms may differ elsewhere. The listing also shows a 5-year guarantee.

What is the Harrison Spinks Platinum 12500 made of?

Natural and recycled materials throughout the comfort layers: British wool, cotton, hemp and flax, plus an Ecotex layer made from recycled fibres. Beneath that sit three layers of pocket springs. The mattress is 29cm deep and handcrafted in the UK.

How much does the Harrison Spinks Platinum 12500 cost?

It depends on the size you choose, and the price table on this page shows the current price for each size. Five sizes are available, from UK Single up to UK Super King. It's a premium price, although the 12,500-spring construction and natural fillings help explain where the money goes.