The Cushion Lab Pressure Relief Seat Cushion The cushion lab seat cushion is a patented pressure relief seat cushion for long (or short!) sitting hours in home, office, car. Xtra comfort for hip, tailbone, sciatica. It is dreamy. * Grippy bottom (see photo) keeps cushion in place * Extra-dense charcoal memory foam provides immediate and ongoing support * Ergonomic design makes sitting more comfortable, longer * Color: Gray * Condition: Like New (removed from company packaging to photograph. * Dimensions: Standard: 18 W x 15.5 L x 4 H inches (Standard Size) * See other listings as I have two of these available From Cushion Lab: "Imagine sitting all day on any chair in total comfort. Patented shaped by in-house ergonomists, the Ergonomic Seat Cushion is scientifically designed to relieve sitting and hip pressure while improving sitting posture on any chair. Proprietary extra-dense charcoal memory foam is odor resistant, and provides cloud-like support for all-day sitting comfort. * Office or Working From Home - Instantly add enjoyable bottom cushioning to any chair to relax hip muscle and improve posture. * Driving - Enjoy comfy cushioning with every drive without fatigue. * Grippy Bottom Secures the cushion against your chair, removable in seconds. * Proprietary HYPERFOAM - soft, rebounding memory foam, infused with charcoal to prevent odor and conforms naturally around the leg and hip ** Photos 2-4 are of actual product / others from cushion lab