I don't own a car, and these were prepared for when I visited relatives with my child. I think I only used them once or twice, if that. Therefore, one of the two-piece set is completely unused, and the other is almost unused. The boxes have some minor tears and discoloration. The following is a quote from the Costco online store: Product Features: Suitable for travel and outings. Can be used in rental cars and taxis. Easy to remove, so it doesn't get in the way of the back seat. Adjustable to fit the child's size, so you don't need to buy a new one as your child grows. Convenient, comfortable, and very practical. The Smart Kid Belt is a belt-type child restraint system that complies with road traffic laws. It's very easy to use, just attach it to your car's seat belt! Applicable weight: 15-36kg, Recommended age: 3-12 years old. *Children under 15kg cannot use it, even if they are within the recommended age range. *Recommended for use in the back seat. Made in Poland and very popular worldwide! ① Complies with safety regulations (won't get you in trouble with the police) - The only one in Japan to pass various tests (ECE R44 04 / FMVSS 213) - European/American (Canadian) crash tests ② Easy to install - 3 steps ③ Palm-sized, convenient storage - Can be stored in various places, such as a bag or the car's dashboard. Easy to carry - You can take it with you on short trips in rental cars or buses. Unlike large child seats, it doesn't take up much space.