What are the benefits of a “premium” window?

They significantly differ from the rest. For example, they offer better thermal and acoustic insulation. On the other hand, these are windows developed according to state-of-the-art designs, and the materials used are more innovative. Exlabesa “premium” windows cover a range of the windows (RS-65, ARS-72, RS-77), doors (PRS-72) and the S-lim and Elevable GR patio doors.