Best Square Throw Pillow Inserts of 2026

The Phantoscope 18x18 Pillow Insert is a premium quality insert made of 100% pure cotton cover, filled with hypoallergenic micro polyester, and has poplin piping technology for better durability. The pillow insert is soft, resilient, and easy to clean. It comes in an independent, delicately designed packaging, making it a perfect gift for any occasion.

The Amazon Basics Pillow Inserts come in a convenient 4-pack of 18x18-inch cushions, perfect for refreshing your sofa, bed, or chair with new stuffing. These inserts fit easily inside your existing pillow covers or shams, making them ideal for decorative use. They arrive compressed to save space, but you can quickly restore their fluffiness by tossing them in the dryer on the Air/Fluff cycle for 5 to 10 minutes or fluffing by hand until they reach your preferred thickness. Plus, these pillow inserts are machine washable, so you can keep them fresh and clean with minimal effort.

Get the Phantoscope 18x18 Pillow Inserts, Set of 4 made in the USA with American-made virgin micro-fiber filling and high-quality polyester covers. These hypoallergenic and odorless throw pillow inserts have a high filling capacity, making them soft and resilient with extra resilience and comfort. These universal decorative pillows are great as an accent piece or to support your back. They come vacuum shipped and are washable.

The Pillowflex Synthetic Down Pillow Insert is perfect for those who want an allergy-free, cruelty-free, and odorless pillow. The pillow insert is ultra-soft and versatile, making it perfect for use in your home, including on your couch, sofa, love seat, bed, and reading nook. The product is made in the USA with sustainably sourced fiber and a polyester-cotton blend shell. It comes in a recommended size of 22"x22" inches, perfect for use in a 20"x20" inch sham.

The Oubonun 18 x 18 Pillow Inserts come in a set of 2 and are made with a 100% cotton cover that is breathable and skin-friendly. The pillows are well-made with sufficient 3D high-quality fillings that are durable, soft yet firm enough for back support, providing the best experience for you. These versatile pillows are great for adding accents to your room's décor and can be used in chairs, beds, couches, sofas, offices, cars, etc. They are comfortable, soft, and fluffy, providing suitable softness and firmness. Additionally, the pillows are easy to care for and can be machine washed and tumble dried on low heat.

JIEITIVE Pillow Inserts are crafted from 100% polyester material, ensuring a soft and durable pillow. The size variations make them versatile for different pillow covers. These inserts provide elegance to your space, offering comfort and lumbar support on your sofa or bed. Easy to care for, they can be hand washed or lightly washed with a mild detergent. Additionally, they are vacuum-sealed for shipping, but can be fluffed up easily. Enhance your decor effortlessly with JIEITIVE Pillow Inserts.

The JIEITIVE Pillow Insert offers a soft and durable cushion made from 100% polyester, ensuring your pillow looks full and stays comfortable for a long time. Its filling is crafted from 7D PP material, which feels gentle and supportive, making it perfect for adding comfort to your sofa or bed. Available in various sizes, you can choose a slightly larger insert than your pillow cover if you prefer a plumper look. Plus, these inserts are easy to care for—you can hand wash or lightly wash them with mild detergent and tumble dry, providing you with a hassle-free way to keep your pillows fresh and clean.

The Leeden 18 x 18 Pillow Inserts come in a set of 2 and are perfect for use as sofa, chair, or bed pillows. The 100% cotton cover and 3D high-quality fillings are breathable and skin-friendly, providing ample support when you lie down or lean on them. They are easy to clean, with the option to hand wash or machine wash on gentle cycle and tumble dry on low heat. The hidden zipper makes it easy to remove or add fillings, and they will fluff up within a couple of hours after being shipped vacuum packaged.

Basic Home 18x18 Decorative Throw Pillow Inserts come in a set of 2 and are perfect for use as an insert in decorative shams, couch shams, sofa pillows, and bedroom shams. The 26oz feather and down fill is encased in a durable 100% 233TC cotton fabric with a downproof stitch to prevent feathers from poking out. The insert is vacuum packed for easy shipping and is maintenance-free, only requiring a 20-minute spin in the dryer every other month to keep it fluffy and fresh. For best results, it is recommended to order 2 sizes up from your pillow cover size to provide a plump and full pillow from corner to corner.

The Oubonun Pillow Inserts come in a convenient pack of two, each measuring 18x18 inches and made from soft polyester. When you first open them, they might look a bit flat, but a quick tumble in the dryer on low heat will help them fluff up nicely, giving your pillows a fuller, more inviting look. Gently patting them after unpacking also helps the fibers relax and regain their natural shape over time. These inserts feature clean, defined edges that provide a polished shape, making your pillow covers look crisp and stylish. Filled with premium polyester fiber, they offer a cozy, soft feel that’s comfortable without being too firm, perfect for everyday use.