The main theme of the yacht is strength: Sibelle has a bold exterior profile with a muscular reverse sheer to the bow. The chiselled contours and dark horizontal strip windows lend the yacht a poise and grace. Sibelle has been fully designed in-house by Feadship. Both the exterior and interior design are by Studio De Voogt. The interior design is simple yet sophisticated and based on natural tones, light wood veneers and organic forms for an ambience that is soberly tasteful but also informal and welcoming.