How to design ergonomic backrests for PVC outdoor bar stools?

Designing ergonomic backrests for PVC outdoor bar stools requires a focus on comfort, support, and durability. Start by selecting high-quality PVC material that withstands weather conditions while providing flexibility. The backrest should follow the natural curve of the spine, offering lumbar support to reduce strain. Adjustable angles or slight reclines can enhance comfort for prolonged sitting. Ensure the backrest is securely attached to the stool frame for stability. Finally, test the design with users to refine ergonomics and ensure optimal comfort for outdoor use.