Product description What head sizes does this sun hat fit? The hat covers head sizes from 22.0" to 23.6", and it has an elasticized locking draw cord at back to adjust for head size. That makes it fitted for most people. Does the hat provide proof of the UPF 50 sun protection? Yes the hat has sun protection, and it is UPF50+, which keeps you from the sun while fishing, hiking, camping, traveling. Can this hat be folded and shoved into a backpack without it getting all bent up? The hat can be easily rolled up and put into tote bags/backpacks/duffel bags/beach bags without breaking. Can this protect head from the rain? This hat only offers short-term protection in light rain to keep your head dry. Not recommended for heavy rain. Please also protect your body from the cold.