adidas Trainers Size Guide

adidas Ultraboost 21 runs a little smaller, we recommend going up a half size for a regular fit.

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UK EU US Heel-toe (cm)
4 36 2/3 5.5 22.5 cm
4.5 37 1/3 6 22.9 cm
5 38 6.5 23.3 cm
5.5 38 2/3 7 23.8 cm
6 39 1/3 7.5 24.2 cm
6.5 40 8 24.6 cm
7 40 2/3 8.5 25 cm
7.5 41 1/3 9 25.5 cm
8 42 9.5 25.9 cm

Need further assistance?

The Sports Edit size recommendation:

For adidas trainers we generally recommend taking your usual trainer size, however, if intending to use for running, you may want to size up by half a size for a more comfortable fit.

Not sure which size to choose?

If you have any questions or need help deciding, that’s what we’re here for! Please contact our customer service team who would be happy to assist - email us support@thesportsedit.com or call us on 0203 793 0964.