Adjustable Lumbar Support Pillow for Bed & Sleeping, 4-Layer Back Support Cushion with Height Booster, Dual-Firmness Inserts & Washable Cover, Lower Back Pain Relief for Lying Down. Designed for Lying Down: Deep Lumbar Support in Bed Built specifically for lying down, this 4-layer lumbar support pillow fills the gap between your lower back and mattress to reduce pressure while sleeping, napping, or relaxing in bed.