Not only are all the seams sealed, but the exterior Nylon is laminated with a waterproof backing, making this Hat the ultimate rain stopper. For those days when the weather is a mite unpredictable, a zipper venting system allows for maximum airflow between downpours. When the rain eases, the YYK™ zipper vent allows air to circulate throughout the mesh interior for coolness and comfort. A 3M Scotchlite™ reflective hatband, zipper pull and wind cord make the Waterproof Hat more visible in heavy precipitation or at dawn, dusk or nighttime. An interior size adjuster ensures a custom fit. And if all that wasn't enough, it's retains maximum sun protection as well, rated at an "EXCELLENT" UPF 50+, the maximum rating given.

The Tilley Waterproof hats do run a little small. In some cases, it may be better to purchase 1 size larger then normal (see notes in features section).

Sizing:

S (6 7/8 – 7) M (7 1/8 – 7 1/4) L (7 3/8 – 7 1/2) XL (7 5/8 - 7 3/4)