The Phil and Teds Hammerhead Doubles Kit in black or red, allows parents to transform their Dash Hammerhead into a double stroller. Add the kit to the back to hold your infant while strolling with your tot on top. Or the other option is to place your newborn in the seat reclined fully and place the kit on top for your toddler. 33 Pounds is max weight for the doubles kit to be used in the rear position behind the main stroller seat. When the kit is installed on the top of the stroller, max weight is 55 pounds!