Could be perfect if he was completely impervious to sweat

Note that the received version is the SLIM FIT ARMBAND model, newer model and more expensive.
The cuff is lightweight, ultrathin, and well suited to the iPhone 5 (nu). It holds up well during the race. The rubber ring to the headphone cord is handy.
BUT, however, it presents an important and unacceptable drawback (and this is probably the case for most of these armbands): it is not perfectly sealed to sweat.
Indeed, after a half hour of the race - and I sweat little - the sweat begins to condense - certe very légèrement- in the pocket of the iphone.
This is still a weak condensation but I do not want to take any risk for iphone 5 to 700 euros.

I replaced by a 5- i10 -Iphone home Armpocket. Top of top.Génial and very comfortable, although slightly more cumbersome and more expensive (about 30 euros). Be careful to take the correct version for iphone 5 with 2 outputs for headphones.