seatbelt (n)

Put your seatbelt on, please.
Remember to fasten your seatbelt before starting the car for a safe journey.
The flight attendant emphasized the importance of wearing a seatbelt during the entire flight.
It's a legal requirement to have all passengers wearing a seatbelt while the vehicle is in motion.
The automated announcement reminded passengers to keep their seatbelts securely fastened until the plane comes to a complete stop.