UPGRADED ALL-ALUMINUM FRAME: Our modern patio furniture is crafted with upgraded all-aluminum, which is different from iron sofas on the market. Aluminum was once known as the aristocracy of metals because of its unique properties. The surface of aluminum will naturally form an oxide layer and can protect itself from rusting, fading, and corroding in all kinds of weather. WIDENED ARMREST & SEAT: The aluminum outdoor patio furniture set features widened armrests for better upper-body support, allowing you to lean on comfortably. The thickened seating baseplate can make the sofa stabler. Unlike steel or other materials, the aluminum outdoor furniture set does not deform easily. 5" OLEFIN SEAT CUSHION: Our aluminum patio conversation set is equipped with 5-inch thick cushion. The sponge in the cushion and backrest are both manufactured with high resilience sponge and newly-developed techniques. The aluminum outdoor sectional furniture cover is made of upgraded Olefin fabric.