Size Selection - Our outdoor lounge chair cushion include 1 seat cushion measuring 21” W x 44” L x 3” T and 1 back cushion measuring 21” W x 28” H x 3” T. ( The size description is only for the cushion size, accurately measuring the dimensions of your furniture's seating area in advance, make sure the cushion size fits your furniture ). Multi-Waterproofing Materials: The fabric of our chaise lounge cushion is 300GSM high density polyester which is water resistant. In addition, we laminated a TPU waterproof layer on the fabric. The cushion cover made of multiple waterproof materials gives our patio lounge chair cushions excellent water resistance. Ideally fit for pool lounge chairs. 3-Year Color Fastness: All the fabric of lounge chair cushions for outdoor furniture is solution-dyed fabric. This fabric is made by dyeing the silk threads and then braiding them, which gives the fabric excellent resistance to fading. Covers made from this fabric can easily withstand over 1500 hours of sun exposure. This makes it ideal for outdoor cushions. Whole Piece of High Quality Foam: The seat and back cushions are each made from a single block of 28D highly resilient premium foam. This foam provides excellent support and resilience, ensuring both comfort and durability. Let you enjoy your leisure time to the fullest. Practical Designes: There is a zipper on each of the seat and back cushion covers, and the cushion covers are removable for washing. And ties for the cushion to secure on your patio furniture. The seat and back cushions are detachable for easy splitting and combining.