Recently opened in Sicily, the region’s largest mall “Cen-tro Sicilia”, is characterized by more than 12,000 m² of translucent covering. This single level structure is an ex-cellent example of architectural functionality based on the principles of eco-sustainable design – the most important feature for a center situated in a region where the tem-perature easily reaches very high levels. The application of the skylights of huge size would have allowed for tre-mendous internal heat build-up resulting in extraordinary air conditioning costs. The use of the wide polycarbonate sheets with the exclusive IR filters has permitted to solve the problem of internal overheating, making Centro Sicilia unique project. The Polycarbonate IR sheets constitute covering of all common areas of the center permitting the passage of natural light and maintaining at the same time a comfortable internal atmosphere.