Verdict: The On Cloudmonster 2 outperforms the Allbirds Tree Runners in cushioning (30 mm stack vs 12 mm) and durability, delivering a 15 % longer mileage before noticeable wear (per Runner's World). However, the Tree Runners win on sustainability, using 100 % renewable eucalyptus fibers and costing $35 less (per Allbirds product page). For runners prioritizing maximal comfort on long distances, the Cloudmonster 2 is the clear winner; eco‑conscious casual runners will prefer the Tree Runners.
Allbirds Tree Runners lists at $115 while On Cloudmonster 2 lists at $150 — Allbirds Tree Runners undercuts On Cloudmonster 2 by $35 (30%).
Winner: On Cloudmonster 2
Allbirds Tree Runners: 7.2/10
On Cloudmonster 2: 8.4/10
| Allbirds Tree Runners | On Cloudmonster 2 | |
|---|---|---|
| Upper Material | Eucalyptus tree fiber | Engineered mesh with synthetic overlays |
| Weight | 7.5 oz (212 g) | 9.5 oz (270 g) |
| Drop | 8 mm | 8 mm |
| Cushion | SweetFoam proprietary midsole | CloudTec® Maximalist midsole |
Our pick: On Cloudmonster 2.
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