Cocoon Down Travel Pillow Shell: 100% Nylon Filling: 100% Goose Down Imported For plane, train, tent or cabin, these are the ultimate lightweight travel pillows. In their own stuff sack, they compress to the size of your fist, which makes them small enough to easily fit into your carry-on bag. Pillows available with premium goose down (DP) or premium synthetic fill (SP or SPM). The travel pillows with the synthetic fill either have a black nylon shell (SP) or a black nylon shell on one side and a soft microfiber shell on the other side (SPM).