Polyfiber sense pillows are typically filled with synthetic polyester fibers, which can be fine or coarse depending on the manufacturer and the intended level of support. Cover material: The cover of a poly fiber senses pillow may be made from a variety of materials, including cotton, polyester, or a blend of both. The cover may also be treated with antimicrobial or hypoallergenic properties to help reduce the risk of allergens and bacteria. Size and shape: Polyfiber senses pillows are available in a variety of sizes and shapes, including standard, queen, and king sizes. Some pillows may also be contoured or shaped to better support the neck and head. Firmness level: The firmness level of a poly fiber senses pillow may vary depending on the amount and type of fill material used. Some pillows may be soft and fluffy, while others may be firmer and more supportive.