adidas / Ultraboost

Ultraboost 21

Daily Trainer2021-02-04 · JP · ReleaseChecked 2026-09-24

Ultraboost 21 is a cushioned daily running shoe. Compared with Ultraboost 20, adidas says it uses 6% more BOOST foam and that the redesigned ADIDAS LEP torsion element increases forefoot bending stiffness by 15%. A Primeknit+ upper wraps the foot and provides support during runs.

Key specifications

Weight

All models average 268.9 gDifference from average -

Average of 973 models

Drop

All models average 6.8 mmDifference from average -

Average of 986 models

Stack (heel)

All models average 34.3 mmDifference from average -

Average of 810 models

MSRP

¥22,000 JPY · JP · Tax excluded

All models average ¥16,806Difference from average +5194 JPY

Average of 18 models

This modelAll models average

Stack (forefoot): -
Carbon plate: Unknown
Midsole: BOOST
Outsole: -
Use cases: Daily / Jog

Plate notes The material of the ADIDAS LEP structure is unconfirmed.

IN CONTEXT

Specs in context

Weight × stack788 models shown

adidas Ultraboost 21Weight and stack unconfirmed

Weight distribution973 models

95 g385 g

This model -All models average 268.9 gDifference from average -

Drop distribution986 models

0 mm12 mm

This model -All models average 6.8 mmDifference from average -

Stack distribution810 models

5 mm60 mm

This model -All models average 34.3 mmDifference from average -

MSRP distribution · JPY · JP · Tax excluded18 models

¥7,000¥30,000

This model ¥22,000All models average ¥16,806Difference from average +¥5,194

Unknown values are excluded. Shoe sizes and measurement conditions vary, so use these averages and distributions as a guide when comparing specifications.

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