Unfortunaltey the vbest & narrowest booster seat avaiable out there right now, which is actually the safest, and cheap is an infa secure brand one, but due to the new laws it cannot be used for any child under the age of 4 because it doesn't have a 5 point built in harness. we have a 2 1/2 yo and cannot buy the narrow seat due to the new laws, so we will be waiting & hoping a more narrow seat is released, or living with what we have until he is old enough.