A practical guide for UK runners
running vest phone holder for marathon training
A running vest phone holder for marathon training should be tested during ordinary training before race day. The Défi vest carries a phone and small essentials, not a full marathon kit load.
Purchase, availability and delivery details are shown on Amazon UK.

Défi running vest · UK guide
running vest phone holder for marathon training
Guide / 01
Rehearse the phone set-up on easy runs
Measure your phone and case against the 20 × 13cm chest pocket. Load it, close the zip and check comfort on a short easy run before using it for a longer session.
Guide / 02
Plan fuel and hydration separately
The shoulder pockets are 10 × 5cm each; no bottle or reservoir capacity is confirmed. Plan nutrition and water according to your training route and coach’s guidance.
Guide / 03
Keep a race-day checklist
Confirm the event’s rules, required kit, phone battery and route plan. A phone carrier does not replace event equipment or guarantee that a device is protected in rain.
Good to know
Questions, answered.
Is the vest a complete marathon running pack?
No. Its confirmed storage is a phone-sized chest pocket and two small shoulder pockets; hydration and full race-kit capacity are not specified.
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