Harrison Spinks Grassington 5750 Pocket Mattress
The Harrison Spinks Grassington 5750 is a pocket spring mattress with 5,750 springs and a comfort layer of natural Yorkshire wool, cotton, flax and hemp.
- Precise support along your spine
- Wicks moisture for drier, cooler nights
- Hypoallergenic natural fillings
£1,005
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The Harrison Spinks Grassington 5750 sits at 28cm deep, is rated medium to firm, and comes in sizes from UK Single up to UK Emperor. There's no foam here, just fibres and springs, which means it sleeps cooler than most memory foam options and suits people who tend to overheat. It's a natural-fill mattress at a serious price, so the question is whether the materials justify the outlay. For many sleepers, they will.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
28
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
5
Price Range
£844 to £2,488
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose this if you want natural materials and strong support without foam. The 5,750-spring count, achieved with Harrison Spinks' Cortec Quad Core system combining traditional and mini springs, means the mattress responds to your body in smaller zones, so you get more precise support along your spine. The wool, cotton, flax and hemp comfort layer wicks moisture and regulates temperature, which you'll feel as a drier, cooler night. It's hypoallergenic and from a National Bed Federation approved brand. Buying through Mattress Online, you get a 100-night trial (a mattress protector purchase is required) and a 5-year guarantee, plus free delivery to most UK mainland locations.
Key features & layer details
Comfort Layer
100% natural Yorkshire wool blended with cotton, flax and hemp fibres. These wick away moisture and regulate temperature, which means less overheating than you'd get from synthetic fillings.
Support System
5,750 pocket springs, a mix of traditional pocket springs and mini springs, each encased in breathable cloth pockets using Harrison Spinks' Cortec Quad Core spring system. Each spring moves independently, so you feel support where your body needs it rather than a uniform push back.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Warm sleepers
With no foam and a wool, cotton, flax and hemp comfort layer that wicks moisture, this mattress sleeps cooler and drier than most memory foam options.
Allergy sufferers
The mattress is described as hypoallergenic and uses natural fibres rather than synthetic fillings, which makes it a sensible choice if you want a cleaner sleep surface.
Back sleepers
A medium to firm feel and 5,750 springs working in smaller zones give precise support along the spine, so your back stays well supported without sinking.
Couples
Each pocket spring moves independently, so support follows each person's body rather than pushing back uniformly, and sizes up to UK Emperor leave plenty of room.
Eco-conscious buyers
The comfort layer is 100% natural Yorkshire wool blended with cotton, flax and hemp, and there is no foam anywhere in the build.
If you like a soft, sinking feel, this medium to firm mattress will likely be too solid, and some owners say it feels firmer than expected at first. It's also a heavy mattress, so if turning or rotating it yourself would be a struggle, factor that in. Budget buyers may find the starting price hard to justify.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Harrison Spinks Grassington 5750 Pocket Mattress
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FAQ's
How firm is the harrison spinks grassington 5750?
The retailer specification lists it as medium to firm. Owner reviews suggest it can feel a little firmer than expected initially and takes an adjustment period, so lightweight side sleepers in particular may find it on the firm side.
Does the harrison spinks grassington 5750 come with a trial?
Mattress Online lists a 100-night trial, though it requires you to buy a mattress protector from them. That trial is the retailer's own offer, so check terms if you buy elsewhere.
What is the grassington 5750 made of?
A comfort layer of 100% natural Yorkshire wool with cotton, flax and hemp fibres sits over 5,750 pocket springs, a mix of traditional and mini springs in Harrison Spinks' Cortec Quad Core system. There's no foam, and the mattress is hypoallergenic.
How much does the harrison spinks grassington 5750 cost?
It depends on the size you choose, and the price table on this page shows the current price for each size. It's available in UK Single, Double, King, Super King and Emperor. A significant spend, but the natural fillings and high spring count are where that money goes.
What guarantee does the grassington 5750 have?
The Mattress Online listing states a 5-year guarantee. That's stated on the retailer's page rather than confirmed as a brand-wide term, so it's sensible to confirm guarantee details with whichever retailer you buy from.
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