Using regular indoor pillows on your outdoor furniture is generally not advised. While it might seem convenient, indoor pillows are not designed to withstand outdoor conditions. The primary issue is material. Most indoor pillows are made from fabrics like cotton, linen, or velvet, which absorb moisture. When left outside, they can quickly become damp from dew, rain, or humidity. This leads to problems like mildew, mold growth, and unpleasant odors. The filling inside, often down or polyester fiberfill, will also clump and degrade when wet.
Outdoor pillows, in contrast, are specifically engineered for exterior use. They feature weather-resistant covers made from solution-dyed acrylic, polyester, or olefin. These fabrics are quick-drying, UV-resistant to prevent fading, and often treated to resist mildew. Their fillings, typically quick-dry foam or polyester, are designed to shed water. Therefore, for the longevity and hygiene of your pillows, and to maintain a clean, fresh-looking outdoor space, investing in purpose-made outdoor cushions is the recommended choice. If you must use an indoor pillow temporarily, ensure you bring it inside immediately after use and never leave it exposed to the elements.