Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
28
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
5
Price Range
£919 to £2,675
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.
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 & what's inside
- 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.
Who's it NOT for?
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 £919.00 upwards hard to justify.
Harrison Spinks Grassington 5750 Pocket Mattress
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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?
Prices range from £919.00 to £2,675 depending on 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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