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About the scoresThe scores are calculated mechanically by applying the criteria table at the end of the page to figures published on the manufacturers' official pages and manuals (and on retail or comparison pages where an official figure was not available). We call it the "Spec Score".
Spec Score #1Urethane foam (no coils, 3 layers)
Best for anyone who values a trial period and warranty for peace of mind
4.25★★★★☆Spec Score (out of 5)
See on Amazon¥69,900See on Rakuten¥69,900Price as of 2026-09-17 · affiliate link · Opens the shop's site
Score Breakdown
Specs
| Type | Urethane foam (3-layer flat build, no coils) |
|---|---|
| Thickness | 21 cm |
| Firmness | Firm (265 newtons) |
| Pressure relief | 3 zones (hips, shoulders, legs) |
| Recovery rate | 99.25% |
| Warranty | 10-year warranty |
| Trial period | Free 120-day trial |
| Packaging | W35 × L35 × H104 cm, 16.6 kg with packaging (as shown on the maker page) |
| Extras | Removable, machine-washable cover / CertiPUR-US certified urethane / delivered compressed |
🙂 Good points
- A free 120-day trial and a 10-year warranty
- The cover comes off and can be machine-washed
- Uses CertiPUR-US certified urethane
🙁 Things to note
- The most expensive of the four (69,900 yen at the listing date, 2026-09-17)
- No coils, so look at other products if you want coil support
Sources
Koala official product page
Scores are calculated only from specs published on official and retail pages.