CORE Springbox System. In this model, the main feature is the core's exceptional comfort and adaptability, offering a softer option for the user. FABRICS AND PADDING High-density stretch fabric with antibacterial and anti-mite treatment. Quilted with state-of-the-art technology using a layered quilting system. INTERIOR LINING The interior lining of this model combines the adaptability of Viscodensity with the comfort and breathability of Oxicore and Fibersoft. FINISHING Hand-stitched side handles