Bonnell Spring Mattress for Orthopaedic Patients is covered with sanitized fabric which is treated for anti-dust mite and anti-fungi. The Mattress is based on inner construction of carbon steel bonnell spring of 2.4 mm with 4 turns. Bonnell Spring Mattress has a firm structure that is generated by high density laminated rubberised coir pad and topped with a comfort layer of latex sheet. Bonnell Spring Mattress for Orthopaedic Patients provides the comfort of a pillow top while maintaining correct postural alignment to ensure proper sleep.