- One black seatbelt extender compatible with all airlines other than Southwest, and one blue extender compatible with southwest airlines (except newer 737-800/737MAX8 planes. Make sure to check the type of plane you will be flying on). Our seatbelt extenders are E-9 safety certified for up to 3000lb of pressure. May not be compatible with first class seats.<br> - 2017 improved version. Our seatbelts are made of high strength polyester. <br> - Both Seatbelt extenders are easily adjustable up to 32 inches, using the same mechanism as airline seatbelts.<br> - Each product comes with an owners card for proof of ownership. <br> - Easy to store. Simply roll up each belt and keep it in your pocket , bag, or luggage.<br>