Nontoxic car seats we use and love! The Clek Foonf (railroad fabric) is AMAZING for 3-across as it’s ultra slim. The Nuna Rava is the easiest install and also relatively slim, though not always compatible for 3-across depending on the car. The Britax Marathon Clicktight is the same easy install as the Nuna Rava, nontoxic, and at a much better price point! LTKfamily