Source: The Inner Sea World Guide, pg(s). 298
Magical goz masks were introduced to the Sodden Lands by priests of Gozreh, specifically a sect known as the Storm Kindlers, who were attempting to repair the devastation caused by the Eye of Abendego. The priests failed their self-appointed task, and the frightening masks have since fallen into the hands of the chieftains of the Koboto, survivors of the drowned nation of Yamasa.
The power of the masks enable the wearer to freely navigate the flooded landscape, seeing through fog and smoke. They also grant the ability to breathe water for a short period, and to resist the effects of high winds.