We do intend to carry both sizes sometime in the near future.
Currently At Elmira, we call a Single mattress a Twin (3 x 6) and a double we call a full (4x6) which are both not yet available.
Our smallest mattress sizes at the moment is 4.5 x 6 which is popularly know as Full XL with dimensions of 137cm x 190cm.
Rest assured, we hope to expand our mattress size catalog over time.