Hi, they are like gdiaper and weenees. They fasten by velcro at the front. The main difference from the gdiaper is that the pouch does not come out, you simply stuff the pouch, if not soiled reuse the outer and pouch again.
I have tried one and it does seem ok, it wasn't on long before Rebecca did a poo, so not sure how long the reusable pads will last yet.
Hope this helps