When designing outdoor spaces with acoustic metamaterials, durability is just as crucial as sound absorption. The most resilient materials for such applications include powder-coated aluminum, marine-grade polymer, and teak wood. Powder-coated aluminum offers exceptional weather resistance and can be engineered with perforations for sound modulation. Marine-grade polymer, often used in high-end outdoor furniture, withstands UV rays, moisture, and temperature fluctuations while maintaining acoustic properties. Teak, a naturally dense hardwood, provides longevity and can be paired with sound-dampening inserts. For cutting-edge solutions, consider recycled HDPE (high-density polyethylene) composites, which merge sustainability with noise-reducing capabilities. These materials ensure your outdoor acoustic furniture remains functional and aesthetically pleasing for years, even in harsh climates.