Material:Polyester & Spandex Fabric Fit Most Sofa: Before ordering, we recommend measuring your furniture to determine the right size. Flexible and soft enough: Using high-strength elastic polyester material. It will protect your sofa, super easy to remove and wash. This sofa cover applicable to sofa which there is a gap between seat with backrest and armrest. the white plastics bits that you use to hold in place, push them down and under as far as you can, will hold in place.