Cocoon Air-Core Down U-Shaped Pillow Travel Great for travel. Inflatable air core under a layer of soft, hydrophic down fill. Hydrophobic down fill is an ideal choice for camping and travel pillows; Treated to resist wetting out and collapsing, making it perfect for trips in wet weather or humid climates as it will maintain its loft far longer than traditional down pillows. Zipper and removable bladder, for easy washing. Front has a 100% polyester microfiber shell, back has a 100% 15 denier polyester shell.