The leash is an essential accessory for wing foil safety. You must have a kite leash and a board leash. The wing leash must be elastic so that it does not hurt your arm when you let go of the wing. It should be long enough to maneuver freely but should not drag in your face either. It is best to avoid leashes like those used in surfing, as they can hit you in the face when pumping. For the board leash, anything is possible as long as the accessory is solid (at least 6mm thick). If straight leashes work, prefer coiled (or phone) leashes that do not drag in the water, see hip leashes for ultimate comfort and safety.