UV protection standards for hats are very specific: The fabric must of course be anti-UV (UPF index greater than 50), but this is not enough to claim the finished product is anti-UV. The hat must also have a wide brim and flap which fully protects the face and the back of the neck. The Trek 500 hat meets these requirements so you can go hiking with complete peace of mind: you are perfectly protected! | Forclaz Adult Anti-Uv Hat in Dark Ivy Green, Size 60-62cm/24" Windproof Wide Brim Hat For Travel, Wide Brim Windproof Hat For Travel, Functional Green Six-panel Hat, Windproof Curved Brim Hat For Outdoor, Green Sun Hat With Upf 50+ And Adjustable Fit, Brimmed Windproof Hiking Hats, Windproof Brimmed Hats For Hiking, Windproof Brimmed Hiking Hats, Adjustable Windproof Bucket Hat With Curved Brim