The flag of Finland, also known as the "siniristilippu," features a blue Nordic cross on a white background. The aspect ratio of the flag is 11:18.

Geometric properties and measurements:

1. The width of the blue cross arms is equal to 1/10 of the flag's height.
2. The distance between the cross arms' outer edges and the flag's edges is 1/10 of its height along the hoist and 11/40 of its length along the fly.

Color Codes (Pantone and Hex):

1. Blue - Pantone: 294 C; HEX: #002F6C
2. White - HEX: #FFFFFF