HAPPYNUTS BACK & SEAT CUSHIONS 14-Inch-by-13-1/2-Inch Memory Foam Lumbar Support Back Cushion Pillow with Adjustable Strap, Grey Gently supports your lower back's natural arc to help you sit up confidently and maintain a healthy and vibrant posture; This ergonomic memory foam lumbar support pillow is made of premium memory foam for optimal back support that molds to your back, helping keep your spine in proper alignment; Improved mesh material used to improve airflow and not get too hot; Stretchable strap with buckle design can helps anchor the cushion to your chair. Perfect cushion for office chair, car seat, general automotive, patio chair, dining chair, truck seat, airplane seat, stadium seat and yoga! Overall 14" long, 13-1/2" wide and 4-3/4" thick;