Adidas Adizero Boston 9 vs Adizero Boston 10
Updated August 11, 2026. Specs are men's US 9.
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THE SHORT ANSWER
The Adizero Boston 10, by default. Amazon's Adidas Adizero Boston 9 stock is gone in both men's and women's sizes, so what follows is a record of what changed, not a choice you still have.
- Adidas Adizero Boston 10Sizes running outMen's at AmazonWomen's
Availability last checked Aug 11, 2026. Prices and stock change without notice.
Every spec, side by side
| Spec | Adizero Boston 9 | Adizero Boston 10 |
|---|---|---|
| FIT AND WEIGHT | ||
| Weight | 8.4 oz | 10.4 oz |
| Two full ounces. Road Trail Run said it runs lighter than the number, but the 9 was a shoe people raced in. | ||
| Widths | D | D, 2E |
| Upper | Dual-layer mesh with Coolever lining, snug racing fit | Soft mono mesh with suede overlays |
| CUSHIONING GEOMETRY | ||
| Heel stack | 21.5 mm | 39 mm |
| Adidas quoted the 9's midsole alone and the 10's full stack, so this row overstates the jump; The Running Clinic measured the 9's true heel in the high 20s. The real gain is still around a centimeter. | ||
| Forefoot stack | 12 mm | 31 mm |
| Drop | 9.5 mm | 8 mm |
| MATERIALS | ||
| Midsole | Full-length Boost (TPU) under a Lightstrike EVA topsole | Lightstrike Pro over firmer Lightstrike EVA |
| The whole identity change in one row. Boost's dense TPU bounce and durability were the old Boston; the new two-layer stack ran firm, and the firmness became the complaint that lasted two generations. | ||
| Plate | Torsion thermoplastic midfoot shank | Glass-fiber EnergyRods |
| VALUE | ||
| List price at launch | $120 | $140 |
| OTHER CHANGES | ||
| Plate | Torsion midfoot shank | Glass-fiber EnergyRods |
| Believe in the Run's Dave: 'The rods are way too firm', and his foot fell asleep mid-run. | ||
Weighing whether to switch at all, rather than which of these two to buy? What replaced the Adidas Adizero Boston 9 covers the verdict on the update, what loyalists made of it, and the closest alternatives from other brands.
Buy the Adizero Boston 9
Old stock goneAmazon's stock of the Adidas Adizero Boston 9 is gone in both men's and women's sizes, and discontinued stock does not come back.
Old stock is gone. See what replaced it
Buy the Adizero Boston 10
Sizes running outDiscontinued at retail. Amazon carries what remains, so treat an in-stock size as a closing window, and expect prices to swing.
Availability last checked Aug 11, 2026.
Questions runners ask
- Which is lighter, the Adidas Adizero Boston 9 or the Adizero Boston 10?
- The Adidas Adizero Boston 9, by 2 oz in a men's US 9 (8.4 oz vs 10.4 oz).
- Did the price change between the Adidas Adizero Boston 9 and the Adizero Boston 10?
- Yes. List price went up $20, from $120 to $140. Street prices differ: the older shoe usually sells under list once its successor ships.
- Do the Adidas Adizero Boston 9 and Adizero Boston 10 come in the same widths?
- No. The Adidas Adizero Boston 9 came in D; the Adizero Boston 10 runs in D, 2E. The Adizero Boston 10 added 2E.
- How do the stack heights compare?
- 21.5 mm heel and 12 mm forefoot on the Adidas Adizero Boston 9, against 39 mm and 31 mm on the Adizero Boston 10. That is 17.5 mm more under the heel and 19 mm more under the forefoot. See the stack height note in the table above: the published figures changed convention mid-lineage.
- Is the Adizero Boston 10 still the newest Adizero Boston?
- No. The Adizero Boston 11 replaced it in 2022, so the Adizero Boston 10 now sells as an older model and usually below its $140 list price.