How to design lumbar support in cast iron outdoor seating without adding weight?

Designing lumbar support in cast iron outdoor seating without increasing weight requires a balance of ergonomic principles and material efficiency. One approach is to incorporate hollow or ribbed structures in the backrest, which maintain strength while reducing material use. Another method is to use contoured cast iron panels that follow the natural curve of the spine, distributing support evenly without bulk.

Additionally, integrating strategic cutouts or lattice patterns can enhance airflow and reduce weight while providing adequate lumbar reinforcement. Pairing cast iron with lightweight composite materials for the support section is another innovative solution.

Finally, precision casting techniques allow for thinner, optimized sections that deliver comfort without compromising durability. By focusing on smart geometry and material distribution, designers can create supportive, lightweight cast iron seating perfect for outdoor environments.