Mifold is the most compact and portable booster seat ever invented and is designed for kids. Explore and shop the range of mifold compact, safe and portable car booster seats. Ideal for travel, mifold grab-and-go car boosters provide compact and portable safety. mifold is the world's most compact and portable car booster and hifold the fit-and-fold booster is the world's most adjustable highback car booster.