You are able to change your shirt size, based on availability, online before the deadline of September 1st, 2025 at 11:59 pm PST.

How to Change your Shirt Size

1. Login to your Race Roster Participant Dashboard

2. Confirm that you’re managing the correct race registration (2025 Under Armour Eastside 10K). To switch the event and manage a different race registration click the <- All events button and select the appropriate event.

3. Click the Edit registration button.

4. You will then be taken to the Edit registration details page where you can make any updates to your registration. Each part of your registration is broken up into respective fields.

5. Once you have made the appropriate edits, click the green Save button to complete the process.

If you would like to exchange your shirt after this date, please bring your unworn shirt to the race on September 21st and if we have your size available for exchange, we will happily exchange it there.