Personalized Motocross Dirt Biking BMX Baby Bib. Dirt bike rider with tire tracks and mud for kids who love motocross Our Baby Bib is rated high in convenience and durability and with a variety of fashionable colors, your baby can be trendy. Mix and match to any outfit. 100% cotton ring spun combed heather colors are cotton-poly. Width 7.75", Length 11.75"