Designed for both indoor and outdoor comfort, this 18" Square Olefin Pillow Insert is filled with plush polyester and encased in a durable Olefin shell. Olefin is known for its resistance to moisture, mildew, and fading—making this insert ideal for outdoor use when paired with a weather-resistant pillow cover. Whether you're styling a patio, porch, or living room, this versatile insert offers long-lasting loft and support.