Aspect ratio
Just as important as the surface area is the span and the corresponding profile.
The English term Aspect ratio describes nothing other than that Ratio of span to area. On the whole, "Low-mid aspect" - Foils a thick and deep profile with a large surface area and a small span. They fly steadily and turn easily. In addition they generate a lot of lift and help you take off even at low speeds and with little wind.
The "High Aspect" - Foils are thinner and have a large span. They are highly efficient and glide better through wind holes. You need a little more speed to take off, and they require more feeling when foiling. In return, you achieve a higher final and average speed.
The aspect ratio also influences the curve radius. With the same surface area, an HA-Foil with a radius greater than an LA-Foil.