Which is lighter, the Adidas Adizero Boston 11 or the Adizero Boston 12?

The Adizero Boston 12, by 0.4 oz in a men's US 9 (9.2 oz vs 9.6 oz).

Do the Adidas Adizero Boston 11 and Adizero Boston 12 come in the same widths?

Yes. Both run in D for men's sizes, so a width that fit in the Adizero Boston 11 carries over to the Adizero Boston 12.

How do the stack heights compare?

39.5 mm heel and 31 mm forefoot on the Adidas Adizero Boston 11, against 37 mm and 30.5 mm on the Adizero Boston 12. That is 2.5 mm less under the heel and 0.5 mm less under the forefoot. See the stack height note in the table above: the published figures changed convention mid-lineage.

Is the Adizero Boston 12 still the newest Adizero Boston?

No. The Adizero Boston 13 replaced it in 2025, so the Adizero Boston 12 now sells as an older model and usually below its $160 list price.

Adidas Adizero Boston 11 vs Adizero Boston 12

Updated September 10, 2026. Specs are men's US 9.

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THE SHORT ANSWER

Whichever your size still exists in. The Adizero Boston 11 is discontinued at retail, so remaining pairs sell against a thinning size run, while the Adizero Boston 12 has a full one.

Adidas Adizero Boston 11Sizes running outMen's at Amazon Women's
Adidas Adizero Boston 12Women's

Availability last checked Sep 10, 2026. Prices and stock change without notice.

Adizero Boston 11 · 2022

Adizero Boston 12 · 2023

Every spec, side by side

Spec	Adizero Boston 11	Adizero Boston 12
FIT AND WEIGHT
Weight	9.6 oz	9.2 oz
Widths	D	D
Upper	Thin nylon mesh with a stiff, lightly padded heel counter	Engineered mesh with a thin tongue
CUSHIONING GEOMETRY
Heel stack	39.5 mm	37 mm
	The heel came down 2.5 mm and the drop went from 8.5 to 6.5 mm, a flatter, more forefoot-loaded shoe.
Forefoot stack	31 mm	30.5 mm
Drop	8.5 mm	6.5 mm
MATERIALS
Midsole	Lightstrike Pro over firmer Lightstrike EVA	Lightstrike Pro over softer Lightstrike 2.0 EVA
	The fix two generations of complaints asked for. Lightstrike 2.0 is much softer, and the 50-mile break-in ritual mostly went away.
Plate	Glass-fiber EnergyRods	EnergyRods 2.0
VALUE
List price at launch	$160	$160
OTHER CHANGES
Plate	Glass-fiber EnergyRods	EnergyRods 2.0
	The same rod family as the Adios Pro 3 race shoe.

Weighing whether to switch at all, rather than which of these two to buy? What replaced the Adidas Adizero Boston 11 covers the verdict on the update, what loyalists made of it, and the closest alternatives from other brands.

Buy the Adizero Boston 11

Sizes running out

Discontinued at retail. Amazon carries what remains, so treat an in-stock size as a closing window, and expect prices to swing.

Men's: Check remaining stock Women's: Check remaining stock

Availability last checked Aug 11, 2026.

Buy the Adizero Boston 12

Stocked at Amazon

Men's stock is gone.

Women's: Check price at Amazon

Availability last checked Sep 10, 2026.

Questions runners ask

Which is lighter, the Adidas Adizero Boston 11 or the Adizero Boston 12?: The Adizero Boston 12, by 0.4 oz in a men's US 9 (9.2 oz vs 9.6 oz).
Do the Adidas Adizero Boston 11 and Adizero Boston 12 come in the same widths?: Yes. Both run in D for men's sizes, so a width that fit in the Adizero Boston 11 carries over to the Adizero Boston 12.
How do the stack heights compare?: 39.5 mm heel and 31 mm forefoot on the Adidas Adizero Boston 11, against 37 mm and 30.5 mm on the Adizero Boston 12. That is 2.5 mm less under the heel and 0.5 mm less under the forefoot. See the stack height note in the table above: the published figures changed convention mid-lineage.
Is the Adizero Boston 12 still the newest Adizero Boston?: No. The Adizero Boston 13 replaced it in 2025, so the Adizero Boston 12 now sells as an older model and usually below its $160 list price.