Pyza suit is a gliding suit that can be crafted in Dying Light. The suit's blueprints can be obtained by finding the hidden purple block in the World 1-1 Easter egg.
It is considered a throwable weapon, if you equip it you can glide for a couple of seconds before gaining speed and taking a lot of fall damage.
It can be useful in Old Town for jumping from one building to other without using the grappling hook.
The suit is a reference to the Tanuki suit which appeared in Super Mario 3. However, Mario could glide slightly more before being forced to slowly fall. It functions similar to a Wing-Suit, it allows player to glide while in air for a duration and can be combined with Dropkick to dropkick enemies farther away. The effect will stack if 10 Pyza Suits are made and placed in one of the throwable item/utility slots. Note that this will only increase glide time, not make it permanent.