A1000GR Size: Large, Color: Gray Features: -Designed to relieve and help prevent lower back pain. -Tapered angle of the wedges encourage correct posture. -Available sacro versions with coccyx (tailbone) cut-out to reduce spinal pressure. -Provides proper sitting posture. -Covered with a washable, durable twill fabric. -Made of high quality polyurethane foam. Product Type: -Back Support. Dimensions: Overall Product Weight: -0.8 lbs. Size Large – Overall Height – Top to Bottom: -17″. Size Large – Overall Thickness: -2.5″. Size Small – Overall Height – Top to Bottom: -11″. Size Small – Overall Width – Side to Side: -16″. Size Small – Overall Thickness: -2″.