S curls vary in the sense that the curls are tighter and more spread out, distinguishing between soft or hard S curls. S curls involve a 1.5 twist of the ceramic rod to achieve the wavy silhouette and consist of more layers that add volume and playfulness to the whole look. S curls are more suitable for those with longer hair, preferably below the chest so that the curls can be maximised and elongated to create a more natural look.