The Cocoon Air Core Ultralight U Shaped Neck Pillow has a soft microfiber shell, for comfortable snoozing on long flights or train rides. It features an inflatable air core underneath a layer of premium synthetic fill for lumbar support, when and where you need it. Great for travel. Inflatable air core underneath a layer of premium synthetic fill for cushioning and support. Minimal packing size. Twist valve allows you to customize your level of firmness, for your own personal comfort. Microfiber shell. Size: 15x11x4. Weight 3.0 oz.