Waterproof lumbar positioner cushion designed for wheelchair, maintains the lumbar position of the user avoiding lateral movements and falls. Correct position of the user, the cushion maintains an upright position of the patient in the seat correctly. COMFORTABLE the patient enjoys a comfortable position helping to maintain comfort during their stay in the wheelchair, thanks to its HR foam side cushions the user enjoys a straight position while being comfortable. Thanks to the design of the cushion it can be adapted to other types of chairs, maintaining its properties and functionality, thanks to its Velcro closure allows easy placement and removal.