I needed a wristlet that holds a smartphone for my daily commute.  Something small I can throw into my brief case while riding the train to work.  This wristlet fit the bill, was perfect, except... I really need an outside window to put my train card so I can easily swipe it at the turnstile.  I tried putting my train card in the coin purse, and also with the phone, but it wouldn't swipe through the waterproof material.  I'm keeping the wristlet, hoping to use it on non-commute days, or if I move.