Universal fit: The seat insert is perfectly suited for the hauck Dryk Duo bike trailer (two fit next to each other) but can also be used in other bike trailers with a similar construction. Durable fabric: Thanks to the hard-wearing, durable materials, the seat cushion can be used for a long time, also for siblings. Comfortable padding: The bike trailer attachment is softly padded, offering children elevated seating comfort even on longer journeys. Safe seating: The seat reducer can be easily attached to the seat of the bicycle trailer by means of the 5-point harness, allowing to keep the child safe at all times. Seat reducer for bike trailers: The side restraints and extra padding on the headrest and seat provide your child with extra stability in the bike trailer's seat from 6 months onward.