Casoli 1200. Voted as a ‘Which? Best Buy’ mattress, Sealy’s Casoli 1200 has a deep, 4cm layer of latex, ensuring that each of the 1200 pocket springs are used to their full and most comfortable potential. Having completed orthopaedic specialist testing, the pocket springs have zoned tensions that offer better orthopaedic support and relieve any pressure points or tension from your body. So buy this Casoli 1200 Now £499.00.