The Hang2it duopoly shower curtain comes with a sheer window and snap-away fabric liner to keep the water in the bathtub. This shower curtain is very easy to install and does not need shower hooks to attach to the curtain rod. Just slip the grommets over the curtain rod and you are all set. This duopoly shower curtain is made with the highest quality 100% polyester fabric that provides a soft feel to the hand and is machine washable, so it can stand the test of time. This premium shower curtain uses our patented Hang2It technology that has been trusted by tens of thousands of customers worldwide. The replacement liner is also made with the highest quality 100% polyester fabric that can be removed and installed in seconds. The window will allow you to keep the water inside the tub and allow fresh air in to prevent the liner from flapping against your body as traditional shower curtains do.