Features: Ergonomic seat cushion with hollow center designs reduces pressure on hips and tailbone, featuring breathable milk silk fabric and high resiliences memory foam for all day comfort. Advanced hollow structure promotes airflows to prevent sweating, while contoured memory foam cores adapts to body shape for personalize support and pressure relief. Designed for office professional, driver, and home users requiring prolonged sitting comfort and targeted lumbar/tailbone protective. Optimized for workspaces, car seats, and home desks where breathable support and postures correction during sitting supplies. Machine washable polyester cover with coating combines with slow rebounds memory foam to combat fatigue, heat buildup, and discomfort from hemorrhoids or poor postures. Specifications: Materials: Memory Foam, Polyester Color: As Picture Show, Seven Color to Choose Size: 40x34x8cm/15.75x13.39x3.15inch Package Includes: 1pc Seat Cushion note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.