Foamma 5" x 27" x 27" Upholstery Foam High Density Foam (Chair Cushion Square Foam for Dining Chairs, Wheelchair Seat Cushion Replacement) : Amazon.co.uk: Home & Kitchen
9111 Outdoor Cushions Recovered 27" X 27" X 5" – By Harrington
Cushion Pads for Keter Allibert California Rattan Garden Furniture Sofa Armchair | eBay