Sail loading is a ratio that refers to the weight of the kite, in ounces, divided by the area of its sail in square feet. Lower numbers mean that the kite will usually fly in less wind and higher numbers mean that the kite requires more wind to fill the sail and lift the kite into the air. Lighter, smaller kites will have lower sail loading numbers than larger or heavier kites. However, sail loading is only applicable as a general rule, kite design is still a significant factor when determining specific wind ranges.