What are the best anti-sag supports for canvas sofa cushion interiors?

Canvas sofa cushions are prone to sagging over time, but the right anti-sag supports can extend their lifespan and maintain comfort. Here are the best solutions:

1. High-Density Foam Inserts: These provide firm support and prevent sagging by evenly distributing weight. Opt for high-resilience foam for long-term durability.

2. Plyboard or Hardboard Bases: Adding a sturdy base beneath the cushion prevents sinking and maintains shape. These are ideal for heavy-use sofas.

3. Spring or Webbing Support: Reinforcing the cushion interior with zigzag springs or elastic webbing offers flexibility while resisting sag.

4. Memory Foam Layers: A combination of memory foam and high-density foam balances comfort and support, reducing wear.

5. Adjustable Straps or Bands: These can be tightened periodically to counteract sagging, offering a customizable solution.

For best results, combine these supports with regular cushion rotation and proper maintenance to keep your canvas sofa looking and feeling great for years.