BONNEL SPRING, NATURAL LATEX & SPINAL ZONE PATENTED MATTRESS Taking into consideration your value for comfort, we have designed the most comfortable mattress you could ever want. Vienna uses Natural latex in a Euro-Top construction, and in combination with Spinal Zone patented technology. It is the ideal choice for anyone with back & neck issues. Vienna is an unmatched sleeping surface that provides additional support to the torso. Vienna supports your spine - and you!