Quality Fabric&Thick Filler 100% polyester, waterproof, stain resistant and UV fade resistant. It with good resilience and not easy to deform,resistant to shrinking and wrinkling. Which is mainly used for outdoor furniture. Well Design 20 in Width x 49.5 in Length x 3.5 in Height (seat cushion is 20 in W x 21 in L and back pad is 20 in W x 28.5 in L) Stylish and Durable Designed to withstand light rain, the quality waterproof fabric prevents water from seeping into the cushion. Bring inside when expecting heavy rain.Also the full filling support better that allows you to sit and lounge comfortably for long periods of time. Non-Slip Design This patio chair cushion design with 4 pairs long attached ties , better fix to the chair, makes it more stable and not slide easily.