Fill: Blown Gel Fiber, Microfiber cover. Generously filled with premium Micro-Gel fiber in order to ensure the most comfortable sleep experience for your guests. Unlike other polyester fills, micro gel fiber is siliconized to prevent clumping or fiber migration to corners after laundering ,ensuring maximum loft and comfort. Our gel fiber polyester is hypoallergenic and mimics the softness of down but at a fraction of the cost. These easy care pillows are machine washed and dried.