Koala Calm As Mattress (Double) vs Vi-Spring Herald Superb Mattress (Double) (2026)
Which is better? We compared both on score, owner ratings, pros and cons.
Koala Calm As Mattress (Double)
Australian design, open-cell foam, copper-infused, 120-night trial, 10-year, B-Corp certified.
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Vi-Spring Herald Superb Mattress (Double)
Calico pocket springs, natural wool + cotton, hand-tufted Plymouth UK, 30-year guarantee. British luxury benchmark.
Check Price ↗ Full ReviewAt a Glance
| Koala Calm As Mattress (Double) | Vi-Spring Herald Superb Mattress (Double) | |
|---|---|---|
| 247Verdict Score | 9.0/10 | 9.4/10 |
| Owner Rating | 4.5★ (4,800) | 4.6★ (1,400) |
| Verdict | Excellent | Excellent |
Quick Verdict
Both are strong choices, but the Vi-Spring Herald Superb Mattress (Double) edges ahead with a 9.4/10 vs 9.0/10. Calico pocket springs, natural wool + cotton, hand-tufted Plymouth UK, 30-year guarantee. British luxury benchmark. That said, the Koala Calm As Mattress (Double) is worth considering if Australian design, open-cell foam, copper-infused, 120-night trial, 10-year, B-Corp certified..
Pros & Cons Side by Side
Koala Calm As Mattress (Double)
- 120-night trial — the longest single-period trial alongside DreamCloud reviewed
- B-Corp certified — Koala's environmental and social standards verified by third-party assessment
- Copper-infused open-cell foam provides antimicrobial properties alongside cooling
- Australian design heritage applied to UK market — different design philosophy from UK brands
- 10-year warranty with B-Corp accountability for long-term quality commitment
- Less brand recognition in UK vs Emma, Eve or Simba
- Copper infusion adds cost without the temperature improvement of true airflow hybrids
- Australian brand with UK fulfilment — customer service response from Australian headquarters
Vi-Spring Herald Superb Mattress (Double)
- Hand-tufted in Plymouth since 1901 — over 120 years of British premium mattress manufacturing
- Calico-wrapped pocket springs flex independently for precise body contouring without partner disturbance
- Natural wool, cotton and horsehair fillings breathe naturally — cooler than synthetic alternatives by design
- 30-year guarantee — double Hypnos' 15-year commitment
- Used in Ritz London, The Savoy and leading UK luxury hotels since the 1900s
- £2,000+ for a double — the most expensive mattress reviewed
- Natural fillings require professional cleaning — not standard fabric maintenance
- 30-year guarantee has specific conditions — read the small print on natural fibre expectations
FAQ
Which is better, Koala Calm As or Vi-Spring Herald Superb?
Both are strong choices, but the Vi-Spring Herald Superb Mattress (Double) edges ahead with a 9.4/10 vs 9.0/10. Calico pocket springs, natural wool + cotton, hand-tufted Plymouth UK, 30-year guarantee. British luxury benchmark. That said, the Koala Calm As Mattress (Double) is worth considering if Australian design, open-cell foam, copper-infused, 120-night trial, 10-year, B-Corp certified..
Is the Koala Calm As worth the extra cost?
The Vi-Spring Herald Superb Mattress (Double) matches or exceeds it at a potentially lower price point.
Also Worth Considering
Hypnos Pillow Top Wool Mattress (Double)
Hand-tufted, British wool, pocket springs, Royal Warrant. The hotel mattress in your home.
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Hypnos Orthos Support Mattress (Double)
Hand-tufted, ReActivePro springs, natural fillings, Royal Warrant, UK made. The royal mattress.
Check Price ↗ Full Review
Tempur Cloud Medium Mattress (Double)
TEMPUR material, medium soft feel, 25-year warranty, SmartCool cover. The pressure relief benchmark.
Check Price ↗ Full Review