There are some additional categories of zippers on Patagonia items:

Metal zippers have metal teeth and require associated sliders.

Reversible zippers can be used inside-out and have a slider with a pull on both sides or a pull that can move from one side to the other.

Invisible zippers are designed so the teeth and tape are concealed and only the pull tab is visible from the outside. These zippers are difficult to repair.

Plastic sliders are on some items instead of the standard metal.