I would say based on every pocket coil mattress I have ever looked @ (Carpe Diem, Hastens, Vi-Spring, Hypnos, Marshall) the GreenSleep pocket coil is probably the most durable. The coils are heavy 13.5 gauge steel (very thick for a pocket coil), and wrapped in rubberized coir. Technically the beds come with seperate toppers that are filled with natural rubber wool and cotton covered. The toppers are replaceable but they are quite durable as they are made out of rubber and contain no polyurethane foam. The bottom coil cores have no upholstery at all, so they should last a very, very long time before needing replacing. The firmer model (Molena) has a pretty solid feeling to it, definitely does not feel like a pillowtop at all.