A spring mattress, like the Durfi model, typically uses a system of coils or springs to provide support and comfort. These mattresses are designed to offer durability and a firm, stable foundation for sleep. The springs can come in various configurations, such as Bonnell springs, which are interconnected for a sturdy feel, or pocket springs, where each coil is individually encased to ... https://www.durfi.com/products/hybrid-pocket-spring-mattress?variant=41531850686525