NWOT Favoyard Outdoor Seat Cushion Cover Set 24 x 24 Inch Waterproof & Fade Resistant Patio Furniture Cushions Cover Deep Seat & Back Cushion with Handle and Adjustable Straps for Chair Sofa Couch. Color is Spice. Size Selection Tips and Warranty - Measure the furniture before you purchase is indeed a efficient method to choose the right size cushion for your furniture. Width: measure the distance between the arms on the both sides. Depth: measure the distance from the front to the back of the furniture seat. Then compare with cushion size: 24 x 24 x 4 inch seat cushion + 24 x 20 x 6.5 inch back cushion.