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How to use a travel pillow
Try your neck pillow before buying it.
Neck pillows don't typically come in different sizes, so the only way to know if it will fit comfortably is to try it on. If possible, put your neck pillow on before you buy it, or keep the receipt and try it on before your trip.
You should be able to rest your head on it without bending your neck uncomfortably, and the material shouldn't pinch or chafe on your neck. Inflate your pillow if necessary.