Key Chain Boys Briefs with Car Patterns on them are totally cute and comfortable. Made with a covered elastic waistband which is great for not irritating sensitive skin. These are made to last a long time. They run pretty true to size. They have a good fit by the crotch as opposed to some brands that are too big in the crotch. Key Chain boys car print briefs. These are made from cotton and have a covered waistband. They have a great fit and are adorable. Please note that the car pattern will either look exactly like the ones in the photo or similar.