It’s natural to assume that the least expensive options might not be as safe as some of the higher end designs, but that simply just isn’t the case. All designs must meet certain safety requirements in order to be able to be sold to the public. The higher end designs are priced to be more expensive because they often have certain bells and whistles that other designs just don’t have. For instance, some options use high end and breathable materials, as well as using certain types of foam. These features don’t make the unit any more or less safe, it just makes it a little bit more comfortable. Some options have simple and easy to use locking mechanisms that make it easier to take in and out of your vehicle, and might be the reason that they are offered at a higher price tag.