Koala Calm As Mattress (Double) vs Purple Hybrid Premier 4 Mattress (Double) (2026)

✍️ By the 247Verdict Editorial Team📅 Updated 05 October 2026

Which is better? We compared both on score, owner ratings, pros and cons.

Koala Calm As Mattress (Double)

9.0/10 Excellent

4.5★ (4,800 owners)

Australian design, open-cell foam, copper-infused, 120-night trial, 10-year, B-Corp certified.

Full Review

Purple Hybrid Premier 4 Mattress (Double)

9.2/10 Excellent

4.4★ (6,800 owners)

GelFlex Grid 4", pocket springs, no heat retention, motion isolation. The grid mattress premium.

Full Review

At a Glance

	Koala Calm As Mattress (Double)	Purple Hybrid Premier 4 Mattress (Double)
247Verdict Score	9.0/10	9.2/10
Owner Rating	4.5★ (4,800)	4.4★ (6,800)
Verdict	Excellent	Excellent

Quick Verdict

Both are strong choices, but the Purple Hybrid Premier 4 Mattress (Double) edges ahead with a 9.2/10 vs 9.0/10. GelFlex Grid 4", pocket springs, no heat retention, motion isolation. The grid mattress premium. 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. Check the current price on Amazon →

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

Purple Hybrid Premier 4 Mattress (Double)

4-inch GelFlex Grid — thickest Purple grid for maximum pressure relief
Genuinely temperature-neutral — GelFlex Grid doesn't retain body heat like foam
Pocket spring base provides motion isolation and responsive support
Purple's patented grid technology is uniquely different from every other mattress material
6,800 Amazon reviews at 4.4★ from converted hot sleepers who tried everything else first

£2,000+ requires conviction about grid technology vs foam/hybrid alternatives
Grid feel is distinctly different — not universally preferred by those used to foam
US brand with variable UK customer service response

FAQ

Which is better, Koala Calm As or Purple Hybrid Premier 4?

Is the Koala Calm As worth the extra cost?

The Purple Hybrid Premier 4 Mattress (Double) matches or exceeds it at a potentially lower price point.

Who is the Koala Calm As best suited to?

Australian design, open-cell foam, copper-infused, 120-night trial, 10-year, B-Corp certified.

Who is the Purple Hybrid Premier 4 best suited to?

GelFlex Grid 4", pocket springs, no heat retention, motion isolation. The grid mattress premium.

What are the main downsides of each?

Koala Calm As Mattress (Double): Less brand recognition in UK vs Emma, Eve or Simba; Copper infusion adds cost without the temperature improvement of true airflow hybrids. Purple Hybrid Premier 4 Mattress (Double): £2,000+ requires conviction about grid technology vs foam/hybrid alternatives; Grid feel is distinctly different — not universally preferred by those used to foam.

Do owner ratings agree with our verdict?

Largely, yes — Koala Calm As Mattress (Double) sits at 4.5★ from 4,800 verified Amazon owners, and Purple Hybrid Premier 4 Mattress (Double) at 4.4★ from 6,800.

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