Flammi Women's UPF 50+ Folding Baseball Cap Cycling Sun Cap with Removable Breathable Mesh Mask Nylon Cool thin fabric, 360 circulatory breathe freely, great moisture absorption, wick sweat, quick dry, soft feeling Fit head circumference 22"-23". See description for measurement details. Back has elastic band for snug fit, and a hole for ponytail Detachable mesh mask connected to hat with snap fasteners protects your face, neck from scorching sun in outdoor activities The length of bill is 3.7"/9cm, which can be a good cover from strong sunlight Compact and foldable. The folding size (about 6.3" x 3.1") is almost the same as smartphone. The multi-purpose sun hat is suitable for outdoor sport, travel, photographing, running, walking, exercise & fitness, fishing, mountaineering, hiking, working, cycling, shopping, beach, camping, hunting, farming. Fashion hat has many different ways to wear