Your outdoor cushions would look their best, and last longer if made with water resistant fabrics. However, if you want added protection for your outdoor foam, here are some options that would make your cushions water proof.
Cover the stuffing – If you use polyester fiberfill as stuffing for your outdoor cushions, you should insert it into a protective water-resistant cover. Look at fabrics that are at least 60-inches, made from polypropylene. Polypropylene is a non-woven, water-repellent, non-allergenic fabric that is also resistant to stains.
Outdoor pillow inserts – Pre-made pillow inserts can also be purchased from homeware stores and are UV protected, water-resistant.
Compressed Polyester and Polyurethane Foam – Compressed Polyester and Polyurethane Foam are good alternatives to foam and do not compress over time. These foams are washable, air dry quickly and are mildew-resistant and non-allergenic. The foam is treated with biocides, which prevents fungus, mold, and mildew. Make sure you cover the foam before inserting it into the cover.
Open and closed cell foams – Some Open-cell foams are chemically treated with antimicrobial agents and specifically designed for outdoor seating. These treatments also prevent mildew and mold growth. The Foam Factory suggests paired the foam with fabrics that are suitable for outdoor use to keep your cushions dry and help them last longer.
The following options will help you ensure your outdoor seating lasts longer and looks its best all year around.