Upholstery foam cut to any size - foam cushions seat pads high density foam @ TOPSTYLE BEDDING (Upholstery foam Thickness 1" inch, 15" x 15") : Amazon.co.uk: Home & Kitchen
Since Custom Foam Seat Cushion for Sofa Bench, Cut to Size Foam Mattress Pad, Indoor/Outdoor Furniture Seat Foam Replacement, High Density Foam for Sagging Seat : Amazon.co.uk: Garden
Bench Seating Foam Upholstery Cushioning Pad (GB 33H)