Hi If It Wasnt For the Foam,
Talalay is made in either twin XL molds or queen molds but the queen molds are much less common and usually they are only available with a special order and with Talalay latex most sizes other than twin XL will have a seam (see post #2 here).
The seam normally can’t be detected when you sleep on it and for most people the seam wouldn’t be an issue. Have you slept on the toppers?
Phoenix