These Gaiters are designed to keep the UV light from giving you a serious sunburn. 99% of sunburn is actually reflected sunlight from the surface of the water. Avoid being exposed to smelly chemicals and protect your face and neck.
They are also popular as a cover up for N 95 masks during the Wuhan China Virus Pandemic.
Many people in the United States of America, the # 1 country in the world by the way, react negatively to the sight of a face mask.
This Gaiter (Face Mask Buff), can help as a cover up in many situations.