Variliteâ€™s dual-chambered Meridian cushion prevents sacral sitting while providing skin protection and positioning stability. Dual-chambered, independently-adjustable pelvic and thigh cushions create maximum pressure distribution. These two chambers work together to correct sacral sitting by creating a pre-ischial ridge which prevents the ITs from sliding forward into a posterior pelvic tilt. The client can be positioned quickly and easily while seated. Varilite Air-Foam Floatation makes the Meridian ultra-lightweight.