Queen size is not recommended because it will have a problem with weight distribution. In theory, you will need double the weight for a couple to share one blanket. However, making a 20kg blanket will have safety issues hence we don’t make queen size.
Our single weighted blanket is TGA approved. We purposely make our blanket single size instead of a random blanket size so it’s easier for you to buy a cover for it from anywhere (although we think our Bamboo Quilt Covers are pretty neat).
P.S. it is okay to use the blanket without a cover since it is machine washable. Using a cover will allow the blanket to last longer and easier to maintain.