The Adidas Adizero Prime X3 Strung is a road running shoe and the On Cloudmonster 2 is a neutral road running shoe. The Adizero Prime X3 Strung is 0.5 oz lighter (10.1 oz vs 10.6 oz) and is rated higher by buyers (4.7 vs 3.8 out of 5). The Cloudmonster 2 costs about $43 less (from $125).
Specs side by side
| Spec | Adizero Prime X3 Strung | Cloudmonster 2 |
|---|---|---|
| Price | $168 | $125–$180 |
| Rating | 4.7 / 5 (302 reviews) | 3.8 / 5 (30 reviews) |
| Weight | 10.1 oz | 10.6 oz |
| Heel-to-toe drop | 6 mm | 6 mm |
| Heel stack height | 49 mm | — |
| Cushioning | — | Max |
| Support | — | Neutral |
| Surface | Road | Road |
| Available for | Men & Women | Men & Women |
Specs and prices from Adidas and On, checked 2026-10-11. Weight is usually for a men's size 9–10.
Which should you get?
Get the Adizero Prime X3 Strung if…
- you want the lighter shoe
- you want the more widely reviewed shoe
Get the Cloudmonster 2 if…
- you want to spend less
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