TOP HEADWEAR Safari Explorer Bucket Hat With Flap Neck Cover - Camoflauge Hat measurement fro the bottom: 13.5 inches in diameter. 4 mesh vent for air circulation. Adjustable chin cord. Visor Brim: 3.2 inches. Flap to cover neck: 8.5 inches in height. Frontal Panel: 3.6 inches in height. Side Panel: 4.5 inches in height MULTI FUNCTION: Button Fold-able action closure to raise the brim to change the style of the hat. UV Ray Protection Fabric Material: 60% Cotton and 40% Polyester. Small: 6 7/8-7. Medium: 7 1/8-7 1/4. Large: 7 3/8-7 1/2. X-Large: 7 5/8-7 3/4