This is an excellent concept but there must be very few adult men who can use it. For perspective, I'm 6 ft tall and have a 40 inch waist - could be improved but not uncommon. Knees are proportional to the rest.

So I got this thing and decided to try it out. It fit my ankle perfectly but using it as designed was out of the question. I gave it to a friend who is a slender young lady and she said it's just right for her.

Of course you do need something of this kind if you travel. A friend of mine carried his wallet in his front pocket when he charged out on the streets of Paris. A very talented pick pocket relieved him of it within the first five minutes.