I haven't got a picture but the idea is that you need to make channels or baffles on the back that can be filled to add the weight. I'm not positive as to what they use for the filling (styrene beads??) but the weight is supposed to provide a feeling of comfort and security. They are using a similar idea for dogs terrified of thunder - thunder shirts that are weighted to provide a calming effect. I think she'll need to see one before she attempts hers.