The Oxford pillowtop mattress has a 12.5g Bonnell spring system which combines comfort and support. The Bonnell spring system, known for its durability and firmness, uses interconnected steel coils (12.5 gauge thickness), which work together to provide consistent support across the surface of the mattress. The pillowtop layer adds an extra plush feel on top, offering a softer surface for sleeping, typically filled with materials like foam or fiber for additional comfort. This combination makes the mattress suitable for those seeking a balance of firm support and cushioned softness. The 12.5g Bonnell spring is often chosen for its reliability and ability to distribute weight evenly, while the pillowtop adds an extra layer of comfort. The result is a mattress designed for a restful sleep, with adequate pressure relief and enhanced overall comfort. - UK Bed Furniture Oxford Pillowtop Mattress in White - Size: Single