HIGH-QUALITY FABRIC: Our cushion is made of 100% Olefin fabric, water repellent, and durable. The weather-resistant coating protects your cushion against fading for up to 2000 UV hours. HUMANIZED DESIGN: The cushion has a strap design to keep the cushion in place tightly, and prevents the cushion from moving around. ZIPPER DESIGN: Zipper-closure cushion covers allow you to easily remove and clean. Can be either wiped clean with a damp cloth or machine washed keep it looking as good as new with ease. OUR RECOMMENDATION: If you want the straps to fit properly on the back of the sofa, it's recommend that the chair back be no more than 26" wide and no more than 4" thick. CUSHION SET INCLUDED: The 14-Piece Patio cushion set come with 6 seat cushion, 6 long backrest cushion, and 2 small backrest cushion.