Custom DIY Upholstery Foam for Cushions - Cut to Size
Amazon.com: Foamma 2" x 24" x 24" High Density Upholstery Foam Padding, Thick-Custom Pillow, Chair, and Couch Cushion Replacement Foam, Craft Foam Upholstery Supplies, Foam Pad for Cushions and Seat Repair :
JWB - Museum Art Foam
PF90 High Density Polyurethane Foam 100mm - Easy Composites