Very good product but 4 stars

Tested for the first time during a mountain bike ride of 40 km, this armband Belkin (almost) all its promises. I say "almost" because disappointed in the level to scratch. Do not have a big arm because when extending and when the biceps contracts, the scratch comes off.
For cycling, great, because the arm and in the same position.
To see for running when the arms are pendulum.
The tightness nothing wrong as the plastic surface which leaves a large availability of touch even though sometimes it's hard to read the display in direct sunlight.