A practical guide for UK runners
running vest phone holder for triathlon
A running vest phone holder for triathlon needs to be considered against the event’s rules and transition plan. The Défi vest is not described as triathlon-tested or race-approved.
Purchase, availability and delivery details are shown on Amazon UK.

Défi running vest · UK guide
running vest phone holder for triathlon
Guide / 01
Confirm the race regulations
Event rules can restrict what may be worn or carried during each discipline. Check with the organiser before using a phone vest in a sanctioned race.
Guide / 02
Consider when you need the phone
The zipped chest pocket measures 20 × 13cm. If you plan to carry a phone during training, check fit and access outside the race context first.
Guide / 03
Do not assume swim or weather protection
The pocket is water-resistant, not waterproof, and the product is not described for swimming. Use equipment intended for each discipline and protect electronics separately.
Good to know
Questions, answered.
Is the vest approved for triathlon races?
Race approval is not confirmed. Check the specific event rules and organiser guidance before use.
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