The Adidas Adizero SL 2 and On Cloudboom Echo 3 are both road running shoes. The Adizero SL 2 costs about $65 less (from $65). The Cloudboom Echo 3 is 0.8 oz lighter (7.6 oz vs 8.4 oz).
Specs side by side
| Spec | Adizero SL 2 | Cloudboom Echo 3 |
|---|---|---|
| Price | $65 | $130 |
| Rating | 4.7 / 5 (461 reviews) | — |
| Weight | 8.4 oz | 7.6 oz |
| Heel-to-toe drop | 9 mm | 9 mm |
| Heel stack height | 36 mm | — |
| Cushioning | — | Max |
| Surface | Road | Road |
| Available for | Men | 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 SL 2 if…
- you want to spend less
Get the Cloudboom Echo 3 if…
- you want the lighter shoe
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