An interesting idea for those who goto the gym or workout regularly.
It is designed for carrying your gym ID, credit cards, money, a small car key or house key or other things. In total you can carry three credit card sized items (or cash) and one key. ArchPort™ cartridge is strategically placed at the shank region for extraordinary stability, and foxing band joining the upper. It features a non-marking rubber outsole and high density nylon cavity and cartridge structure.