For the frame, prioritize kiln-dried solid wood (oak or ash) or reinforced steel to prevent warping and ensure a lifespan of 10+ years. Regarding comfort, the seat cushions should feature high-resiliency (HR) foam with a density of at least 35kg/m³, ideally combined with pocket springs to prevent sagging. For upholstery, if selecting fabric, ensure a Martindale rub count of ≥30,000 for commercial use; if selecting leather, verify it is top-grain or full-grain leather for breathability and durability.