When choosing outdoor sofa frames for coastal environments, durability and resistance to saltwater, humidity, and UV exposure are critical. The best materials include:

1. Aluminum: Lightweight, rust-proof, and low-maintenance, aluminum is ideal for coastal areas. Powder-coated finishes enhance its weather resistance.

2. Teak Wood: Naturally resistant to moisture and insects, teak develops a silvery patina over time, adding rustic charm.

3. Stainless Steel: Highly corrosion-resistant, especially marine-grade stainless steel, though it requires regular upkeep.

4. Synthetic Wicker: Resin-based wicker mimics natural fibers but won’t degrade in salty air. Pair with aluminum frames for longevity.

5. Marine-Grade Polymer: Plastic polymers designed for marine use resist fading, cracking, and salt damage.

Avoid untreated wood or iron, which corrode quickly. Opt for materials with protective coatings to extend lifespan in harsh coastal conditions.