1 in 3 cell cycle for optimum healing environment, reduced sensation of movement and lower average support pressure (compared to 1 in 2 alternation)|cell in cell design enhances user safety and optimises comfort by increasing the clearance between inflating and deflating cells|independent heel zone for individualised therapy to vulnerable heel and lower leg area|hinged base for continuous pressure therapy when upright in bed|permanent internal side bolsters for increased patient safety, lateral stability and system effectiveness|visible and accessible CPR tag plus ‘D handle’ control unit connection for extra fast emergency deflation|vapour permeable, waterproof top cover with multi stretch fabric to minimise friction and reduce shear|maximum infection control including welded seams and full length waterfall skirt|static head cells to add stability and reduce sleep disturbance|fully adjustable digital control unit with eight comfort pressure settings; visible and audible alarm; timed transport and static functions for stable patient treatment