Britax Infant Positioning Insert (Prior Model)
Brand: BRITAX
Color: black
May be necessary for small infants to achieve a snug fit of the harness around your child
Sled tested and certified for use with the following britax convertible car seats: Roundabout 55, Marathon 70, Boulevard 70, Boulevard 70 cs, Advocate 70 cs
For use with infants weighing between 5 and 11 pounds