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Mattress comparison guide
Harrison Spinks Iona 10,500 vs Platinum 12,500
If you have been looking at the Harrison Spinks Iona 10,500, the Platinum 12,500 is a premium turn-free Harrison Spinks mattress worth comparing.
Available at Mayfield Furniture
Harrison Spinks Platinum 12500 Natural Pocket Mattress
Available to try at MayfieldThe short answer
The Iona 10,500 and Platinum 12,500 share turn-free construction, Cortec Quad Revolution springs, three rows of side stitching and the same principal tension choices. Their additional spring layers and natural filling blends are configured differently, so they should be treated as comparable rather than equivalent.
What they have in common
- Mattress type: Both mattresses simply need rotating parodically.
- Main spring system: Both use the same principal spring technology.
- Natural fillings: Both use extensive natural upholstery, but their fibre blends differ substantially.
- Tensions: Both offer the same principal tension choices.
- Side stitching: Both use three rows of side stitching.
Key differences
- Spring count: The headline totals include different supplementary spring combinations.
- Additional springs: The Iona includes HD 3,000 springs; the Platinum uses Posturfil springs instead.
Compare the specifications
Mattress type
sameIona 10,500 Turn Free Mattress
Turn free
Harrison Spinks Platinum 12500 Natural Pocket Mattress
Turn free
Both mattresses simply need rotating parodically.
Spring count
differentIona 10,500 Turn Free Mattress
10,500
Harrison Spinks Platinum 12500 Natural Pocket Mattress
12,500
The headline totals include different supplementary spring combinations.
Main spring system
sameIona 10,500 Turn Free Mattress
Cortec Quad Revolution
Harrison Spinks Platinum 12500 Natural Pocket Mattress
Cortec Quad Revolution
Both use the same principal spring technology.
Additional springs
differentIona 10,500 Turn Free Mattress
HD 2,500 + HD 3,000 + HD 4,000 micro springs
Harrison Spinks Platinum 12500 Natural Pocket Mattress
HD 2,500 + HD 4,000 micro springs and Posturfil pocket springs
The Iona includes HD 3,000 springs; the Platinum uses Posturfil springs instead.
Natural fillings
similarIona 10,500 Turn Free Mattress
Wool and viscose, British wool, wool and mohair, natural cotton and Sustainable Ecotex
Harrison Spinks Platinum 12500 Natural Pocket Mattress
Wool and viscose, Yorkshire wool, wool/hemp/flax, cotton/hemp/flax and Sustainable Ecotex
Both use extensive natural upholstery, but their fibre blends differ substantially.
Tensions
sameIona 10,500 Turn Free Mattress
Gentle, Medium or Firm
Harrison Spinks Platinum 12500 Natural Pocket Mattress
Gentle, Medium or Firm
Both offer the same principal tension choices.
Side stitching
sameIona 10,500 Turn Free Mattress
3 rows
Harrison Spinks Platinum 12500 Natural Pocket Mattress
3 rows
Both use three rows of side stitching.
Worth trying at Mayfield
Harrison Spinks Platinum 12500 Natural Pocket Mattress
If the features of the Iona 10,500 Turn Free Mattress appeal to you, this is the Mayfield model we suggest including in your in-store comparison. It is not presented as an identical mattress: the specification above shows exactly where they are similar and where they differ.
View the Harrison Spinks Platinum 12500 Natural Pocket Mattress →Are the Iona 10,500 and Platinum 12,500 the same mattress?
No. These are both premium turn-free Harrison Spinks mattresses, but they use different combinations of supplementary springs and natural fillings.
Their shared characteristics include Cortec™ Quad Revolution® spring technology, three rows of side stitching and a choice of Gentle, Medium or Firm support.
How do their spring systems differ?
The Iona combines its Cortec™ spring system with HD 2,500, HD 3,000 and HD 4,000 micro springs.
The Platinum uses HD 2,500 and HD 4,000 micro springs together with Posturfil pocket springs. The Platinum's 12,500 headline count therefore doesn't simply represent 2,000 additional conventional springs; the internal spring recipes are configured differently.
What about their natural fillings?
The Iona includes blended British wool and viscose, British wool, a British wool and mohair blend, natural cotton and Sustainable Ecotex.
The Platinum uses blended British wool and viscose, a Yorkshire wool blend, British wool, hemp and flax, cotton, hemp and flax and Sustainable Ecotex.
Both make extensive use of natural materials, but the Iona places greater emphasis on wool, mohair and cotton, while the Platinum incorporates Yorkshire wool, hemp and flax blends.
I liked the Iona 10,500 – should I try the Platinum 12,500?
Yes, the Platinum 12,500 is a relevant premium Harrison Spinks model to include in your comparison.
It shares the Iona's turn-free construction, core spring technology, tension choices and three-row side stitching. However, its Posturfil spring layer and different natural-fibre blends mean it shouldn't be presented as an identical or renamed Iona.
The Harrison Spinks Platinum 12,500 is displayed at Mayfield Furniture. We recommend trying the appropriate tension and comparing how it feels rather than choosing between the mattresses solely from their spring counts.
About our mattress comparisons
Mattress manufacturers can produce different models and specifications for different retailers and retail groups. Similar-looking mattresses may therefore have different model names, spring counts, fillings or construction. Our comparison guides do not claim that differently named mattresses are identical. They are designed to explain published specification differences and help you identify models that may be worth trying.
Comparison last updated 17 September 2026.
