THE CUSHION LAB LUMBAR PILLOW IS CRAFTED WITH ULTRA-DENSE HYPERFOAM TO HOLD ITS SHAPE AND STAYS SUPPORTIVE, FOR ANY CHAIR, SOFA, RECLINER OR CAR SEAT.  GREAT DEAL ONLY USED A COUPLE OF TIMES.  PLEASE ASK IF YOU  HAVE ANY QUESTIONS.  back has an adjustable strap to hook onto your chair if needed.  JUST USED A COUPLE OF TIMES, GREAT VALUE FOR YOU!!