The architect envisioned l'Heure Tranquille as an inviting open street shopping mall with a transparent roof structure. Novum was able to develop this concept into an economic design by optimizing the steel and cladding to increase roof transparency. The street between the retail stores is covered by Novum's Air Filled Pillow (AFP) System made with ETFE. The use of ETFE as a large panel roofing material brings natural light to the space below, offering visitors a relaxing, open air feeling, while providing shelter from the elements. The largest pillow covers an impressive 120 square meters.