Choose Your New Cardiff Half T-Shirt!
With Oysho as the new title sponsor of the Cardiff Half Marathon, every runner has the opportunity to receive a high-quality Oysho technical t-shirt on event weekend.
You now have the chance to update your t-shirt fit and size preference, choosing between a Female fit or Male/Unisex option.
If you’re signed up for 2025, please respond as soon as possible so we can get your perfect fit sorted in time for race day. You can make changes to your size until Friday 20 June at midnight.
🚨 Action Required: Confirm Your T-Shirt Details
All participants originally selected a Unisex t-shirt when signing up. If you’d like a Female fit or to change your size, you must update your preference.
If we don’t hear from you, you’ll automatically receive the original Unisex size.
📏 Fit Reminder
T-shirt fits do differ versus previous Cardiff Half events so please check the size guide before making your selection. Sizes are in cm and refer to the width of the front of the tee, under the armpits (A) and the length of the front of the tee (B).
Some participants have fed back that they are opting for a smaller size in the Unisex and the same/a larger size in the Women’s fit – this will depend on your own personal fit preference. If you are between sizes, a larger size is recommended for a comfortable fit.

🎽 New for 2025: Collect Your T-Shirt Early!
This year, for the first time, you can choose to collect your t-shirt pre-event (Friday or Saturday) or on race day (Sunday) at the finish line. International athletes will be able to collect t-shirts when collecting their bibs on Friday or Saturday.
When updating your size, simply tell us your collection preference — this helps us plan ahead. (You can still change your mind on event weekend and don’t need to let us know).
We’ll share more details on collection options closer to event weekend.
✅ Update Your Preference in Minutes:
- Click ‘Update Size Preference’ below
- Enter your Booking ID from Let’s Do This
- Click ‘Manage’ next to your name
- Select ‘Edit your booking information’
- Scroll to the t-shirt section (highlighted in red)
- Select your fit and size
- Choose your collection option
- Hit ‘Confirm’
Please respond as soon as possible so we can get your perfect fit sorted in time for race day. You can make changes to your size until the end of June.
We can’t wait to see thousands of runners representing Oysho in style on the start line!