We carry a variety of UPF rated sun hats to protect you from excessive UV rays that cause skin cancer and premature aging. The Ultraviolet Protection Factor (UPF) rating system measures the UV Protection provided by the fabric. It is much like the SPF rating system used for sunscreen. For instance, a hat with a UPF rating of 50 only allows 1/50th of the UV radiation to pass through it. We have several hats with a UPF rating such as the new Moisture Wicking Sun Hat with UPF 50+, the new Moisture Wicking Boonie Sun Hat and our Moisture Wicking Sun Hat with a Removable Neck Guard. Stay safe and enjoy your outdoor activities with these sun protection hats.