This is a lightweight, breathable hat. It has only been worn indoors. The "Dot Air Hat," made of comfortable material, is perfect for both urban use and activities like hiking and cycling. "Dot Air" is a material developed by Toray with unique "ventilation holes." The wind passes through smoothly, making it less stuffy, and it's surprisingly lightweight. The brim provides over 99% UV protection, creating shade and preventing sunburn on the face and neck. It's also water-repellent, making it stain-resistant and functional.