One size fits all. Convenient for your sleeping in the car with this pillow. Filled with PP cotton provides better cushion in case of accidentalbraking or accidents to protect the shoulders of your family from any harms and cover is removable and washable. Sleep safely mile after mile without a sore neck and shoulder. It can be disassembled and washable non-deforming and very easy to clean. With this comfortable and soft belt pillow your will sleep well meanwhile be protected well. This pillow is made of PP cotton good elasticity comfortably support your head and neck. This seat belt cover pillow can be used on cars trucks automobiles. Easy to install just put them over your seat belt.