Fiber Cushion is a lower cost alternative to the traditional Polyurethane based upholstery foam that you would expect in a living room coach or chair.
Outdoor Foam Seats & Cushions
Filling Types for Custom Size Cushions - Cushion Pros
Outdoor 2 Pack Deep Seat Chair Patio Cushions Memory Foam 24X22X4 Waterproof 2 Layers Cover
Outdoor Upholstery Foam
Outdoor Cushions - FoamOnline
Marine+fabric - Fabric Warehouse
Outdoor Cushion Fiber Foam 4'' x 22'' x 78'' - JT'S Fabrics
Alternative to foam upholstery? : r/upholstery
Outdoor Upholstery Fabric - Fabric Warehouse
Alternative to foam upholstery? : r/upholstery
2 Pack Memory Foam Patio Cushion at 24X22X4, 20X18X4 or 18X16X4
Outdoor Cushions - FoamOnline