Check the stated waist adjustment
Adjustable running vest phone holder
The Défi adjustable running vest phone holder combines a zipped chest pocket with a waist belt that adjusts from 26 to 40 inches. Use the measurements to check fit before ordering.
Purchase, availability and delivery details are shown on Amazon UK.

Défi running vest · UK guide
adjustable running vest phone holder
Guide / 01
Measure over the clothes you run in
The waist adjustment range is 26–40in. Measure over your expected running layers and try the vest on to check the straps sit comfortably.
Fit can vary by body shape and preferred position. The one-size label is not a guarantee that it suits every runner.
Guide / 02
Check the phone pocket separately
The zipped chest pocket measures 20 × 13cm. Measure your phone with its case fitted, including any grip or wallet attachment.
Two 10 × 5cm shoulder pockets provide separate storage for compact essentials. Avoid overloading them or placing hard items next to the phone.
Guide / 03
Test the loaded fit
Adjust the belt with your phone and small items in place, close the zips and take a short walk or jog. Re-adjust if the vest restricts movement or feels uncomfortable.
The chest pocket is water-resistant, not waterproof. Use extra phone protection in heavy rain.
Good to know
Questions, answered.
What is the waist adjustment range?
The belt adjusts from 26 to 40 inches. Check your measurement over your running layers.
Is the chest pocket adjustable?
The pocket is part of the vest; no separate pocket adjustment is specified. Check the product photos and details on Amazon.
Keep exploring
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