The choice of the wing size will depend mainly on the range of use you are aiming for. In a wind range of 10 to 20 knots, for a 70-85kg weight, we recommend a 5m. For a size lower than 70kg, rather 4m and finally for a size higher than 85kg rather 6m. In any case, it is better to increase the surface of the front foil than to increase the size of your wing for lightwind for example.