Our Sri Lanka Dunlop is tapped out of trees in Sri Lanka and poured into molds in 1 piece. Talalay is poured up in Conneticut and only can be poured 40″ wide. To make a queen they have to weld a 20″ piece onto it. The adhesive they use use is called Simalfa, which is made in New Jersey. Simalfa can be looked up easily on the net. We choose NOT to use it since we dont want to add any unnecessary ingredients into our mattresses that might do harm. Keep It Simple.