Britax Seat Extender Insert is designed for use with Britax Baby Carriers (sold separately). Seat extender insert helps ensure comfort for both the parent and larger child when child is faced towards the parent. Provides a wider seating area for your growing child to sit in a natural position when facing inward. Allows your child to wrap their legs around your waist, enhancing longer-wearing comfort and ensuring balanced weight distribution. Machine washable. Imported.