Purchased a few years ago and used several times for travel as it's foldable. While it's on the inside and may not be very noticeable, there are some white areas as shown in the image, so please be aware of this before purchasing. It will be shipped folded. This is a fully blackout hat that cuts 100% of UV rays, 100% of infrared rays, and 100% of visible light. The wide brim provides excellent coverage. The underside of the hat is mesh-lined. The mesh is pocket-shaped, allowing you to insert a small towel or a small ice pack. The mesh uses Toray's refreshing "Field Sensor" material. The blackout effect does not diminish even after washing. Features a Velcro adjuster on the inside, so it can be worn by those with S-size heads.