Cocoon Air Core Down U Shaped Pillow feature an inflatable air core underneath a layer of hydrophobic down fill. combining comfort and support with minimum packing size. A twist valve allows you to customize your level of comfort and support instantly. A small hidden zipper allows you to remove the bladder so that the shell may be washed or any bladder punctures repaired. 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. Size: 15 x 11 x 4 in. Pack Size: 4 x 3 in. Wt. 3.5 oz.