Wind is indispensable for this sport. The wind direction can be determined with the help of flags, trees or flying sand. Sideshore (on the side of the shore) and Side-onshore (on the side of the shore) are best suited for kiting. Off - shore conditions so offshore wind should be reserved only for professionals. The windward side is called LUV (also called upwind) and the downwind side is called leeward (Downwind). On the basis of the wind strength (usually indicated in Bft or knots) and the a persons kite surf ability one determines the suitable material size. The determination of the wind strength is made possible by a wind gauge.