If you're looking for very low-maintenance urban benches, my top recommendation is a bench constructed with a powder-coated steel frame and a precast concrete base or slats. This combination is the champion of durability and minimal upkeep for a reason.
Powder coating provides a exceptionally tough, fused-on finish that resists scratches, fading, and rust far better than traditional paint. It stands up to harsh weather, UV rays, and the wear-and-tear of constant public use. The precast concrete components are incredibly robust, resistant to vandalism, and inherently stable. Unlike wood, they won't rot, warp, or require regular sanding and sealing. Together, these materials create a bench that needs little more than occasional cleaning with soap and water to look its best for years.
Beyond being low-maintenance, this style offers clean, modern lines that suit various urban landscapes, from sleek plazas to community parks. The powder coat comes in a wide array of colors, allowing for aesthetic flexibility. You invest once and enjoy a permanent, attractive seating solution that virtually takes care of itself, saving significant time and resources on long-term maintenance.