PolyesterProper Size: We have multiple sizes for you to choose. This outdoor sofa cover fits up to 60"" L x 34"" D x 30"" H. Please kindly measure your patio sofa before purchasing and it's better to choose the cover 1-2 inch larger than your sofa.Waterproof andamp Uv Protection: The patio sofa cover is made of heavy duty oxford fabric. All the covers are added Pu waterproof and Uv resistant coating, which can protect your sofa from water seeping and keep your couch dry.Air Vent Design: The air vent design helps air circulation to reduce the condensation on your patio sofa and keep the outdoor sofa dry.Easy to use: There are two wide padded handles for you to install and and remove the cover easily. The outdoor couch cover is designed with four click-close straps and cord-lock closure at bottom to keep the cover attached to the sofa legs.