Windshields usually filter UV light, but the other car windows usually don't. In addition a large number of infant car seats consist of a base unit which always

Windshields usually filter UV light, but the other car windows usually don't. In addition a large number of infant car seats consist of a base unit which always remains fastened in the car and a removeable unit which holds the infant. The removeable unit often can also fit into a stroller unit. When used in the stroller the EPP and EPS have a even greater chance of being exposed to UV light.