The COZYWOR Double-Decker Gazebo features a robust 10.5x13.9FT expandable design (up to 23.7FT), engineered with a galvanized aluminum frame and double-vented polycarbonate roof for optimal weather resistance?aincluding 99% UV protection, waterproofing, and corrosion resistance?aenhanced by a dual-track curtain system, ceiling hooks for versatile storage, and tool-free assembly for seamless outdoor setup in gardens, patios, or event spaces.