I don't know if they come in different sizes but mine would almost fit my lower leg. Due to the loose fit, it only bounces on my forearm when walking. It fits in my iPhone, but it's not easy to get it out of the folded case in a hurry. and getting it back with just one hand is problematic. I chose a slim "jogger's belt bag" which is more suitable for me to hold my phone in while walking.
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