Double memory foam mattress (Parson's Heath CO4)

Double Memory Foam Mattress. Medium-firm. Bought from Amazon in 2023; fire-retardant, but the physical label is missing. The invoice does state it is fire-retardant (see photo). The mattress has only been used temporarily. On the back of the mattress cover, there are two marks where adhesive tape was used to secure the mattress to the frame (see photo).