Koala Calm As Mattress (Double) vs Zinus Green Tea Memory Foam Mattress 12-inch (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

Zinus Green Tea Memory Foam Mattress 12-inch

8.6/10 Great

4.4★ (48,400 owners)

Green tea infusion, CertiPUR-US foam, 12-inch, boxed delivery. The most-reviewed budget mattress.

Full Review

At a Glance

	Koala Calm As Mattress (Double)	Zinus Green Tea Memory Foam Mattress 12-inch
247Verdict Score	9.0/10	8.6/10
Owner Rating	4.5★ (4,800)	4.4★ (48,400)
Verdict	Excellent	Great
Infusion	Copper (antimicrobial)	Green tea extract
Foam	Open-cell	12-inch stack

Quick Verdict

Both are strong choices, but the Koala Calm As Mattress (Double) edges ahead with a 9.0/10 vs 8.6/10. Australian design, open-cell foam, copper-infused, 120-night trial, 10-year, B-Corp certified. That said, the Zinus Green Tea Memory Foam Mattress 12-inch is worth considering if Green tea infusion, CertiPUR-US foam, 12-inch, boxed delivery. The most-reviewed budget mattress. 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

Zinus Green Tea Memory Foam Mattress 12-inch

48,400 Amazon reviews at 4.4★ — the most reviewed mattress on Amazon globally
Green tea natural extract infusion naturally fights bacteria and odour
CertiPUR-US certified foam — no harmful chemicals or heavy metals
Under £250 for a 12-inch double — the most affordable quality mattress reviewed
Boxed delivery fits through any door — no mattress delivery logistics required

Memory foam — no pocket springs for couple motion isolation
All-foam construction sleeps warmer than hybrid alternatives
Limited warranty compared to established UK brands

FAQ

Which is better, Koala Calm As or Zinus Green Tea Memory 12-inch?

Is the Koala Calm As worth the extra cost?

Yes — Koala Calm As Mattress (Double) scores higher at 9.0/10 vs 8.6/10.

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 Zinus Green Tea Memory 12-inch best suited to?

Green tea infusion, CertiPUR-US foam, 12-inch, boxed delivery. The most-reviewed budget mattress.

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. Zinus Green Tea Memory Foam Mattress 12-inch: Memory foam — no pocket springs for couple motion isolation; All-foam construction sleeps warmer than hybrid alternatives.

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 Zinus Green Tea Memory Foam Mattress 12-inch at 4.4★ from 48,400.

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