This UPF 50+ full face sun protection neck flap hat delivers comprehensive 360-degree UV shielding, blocking over 99.9% of harmful UV rays to safeguard your face, neck and scalp during outdoor activities. Constructed with premium quick-dry water repellent nylon fabric, the material effectively repels moisture, dries fast and resists soaking through on damp, rainy days, while lightweight breathable mesh panels on top boost airflow to prevent stuffiness during long-time wear. The hat comes with a fully detachable face mask and extendable neck flap, secured with hidden snap buttons for flexible assembly; you can remove either part for partial shade as needed. Equipped with an adjustable drawstring head circumference system, it fits three sizes: S(54cm), M(58cm), L(62cm), paired with a detachable windproof chin strap to stop the hat slipping off during hiking, cycling or fishing in windy conditions. Boasting a 9cm wide brim for extra shadow coverage, all structural components are machine washable without deformation, maintaining shape and sun protection performance after repeated cleaning. Every dimension follows standardized outdoor hat measurements: hat diameter 34-36cm, crown depth 10cm, matching face mask and neck flap sizes for complete coverage. Ideal for fishing, hiking, camping, picnics and off-road outdoor sports, this multi-scenario sun hat also provides secondary defense against mosquito bites. The soft, skin-friendly fabric avoids scratchy discomfort, and the compact foldable design allows easy storage in backpacks for travel and outdoor trips. It serves as a practical all-season outdoor sun accessory for all outdoor enthusiasts.