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).