Cotton SET OF 4 THROW PILLOW COVERS: Each measures 18x18" and can be placed over a pillow insert. PILLOW INSERT NOT INCLUDED EASY CARE: 100% Cotton; Machine wash in cold water separately, gentle cycle, lay flat to dry, low iron if needed; Cotton may shrink DETAILED FINISHES: Zipper is hidden on the back of the pillow case for easy pillow insert and a finished upscale look ENHANCE YOUR HOME: Mix natural texture and rustic charm into the rest of your home by placing these throw pillow covers on benches, beds, outdoor furniture and more MORE OF DII PRODUCTS: DII offers delightful home products including kitchen textiles, home décor, storage, and pet products