SD Card Holder Extreme Sport Micro SD Cardholder (Yellow)

I wanted this one because it said Extreme sport so I assumed it would be extra durable, but I imagine the .1 cheaper version is very similar/the same. I was really surprised to feel the odd foam backing, like those foamy pieces of paper kids craft with. I'm not sure if this is part of its floatation capacity or if it's just got a cheap back. If you look at the photo, you can see warping on the 2nd photo, and when you touch it the middle indents from pressure. It was way thicker than I thought it would be, about 3 1/2 credit cards thick. If I put this in any wallet it would be awkwardly bulky. My last note is that it doesn't even make sense to have a floating Sd cardholder, unless you are Jacques Cousteau going on a deep sea adventure; and even then as far as I know, they don't even make MicroSDs that are waterproof. So it's all pointless and funny but for some reason I thought it would be useful.