Our seat base foam comes in three separate pieces. There is a CNC cut top roll, a specifically shaped lower piece which is cut to fit into the wire basket and a pre formed fibre board panel which sits in the bottom of the basket to stop the foam from falling into the floor pan. The lower piece is marked to allow you to align the top roll in the correct position. Full fitting instructions are given with this product. Adhesive is not supplied-we would suggest you use a contact adhesive to glue the parts together.