While authentic car seats are made using a safe, thoroughly tested design, counterfeit car seats are made with cheaper, flimsier materials using unsafe, non-federally regulated designs. Unfortunately, there is a big difference between counterfeit car seats and authentic ones. These seats appear to be knock-offs of more popular brands, and to a caregiver who hasn’t been specially trained in car seat technology, they may look perfectly safe. A new trend in car seat shopping is counterfeit car seats, mostly sold through online retailers.