Helios' quilt backings fit up to a King Size quilt (108" by 120"). That's 10 square yards of fabric! And they are made in South Carolina at one of the five working fabric mills in the USA. We use them on every quilt we make for the backing, the binding, and even sometimes the piecing. It's great to have one large piece of fabric that you don't have to sew together for a quilt backing.
Quilt Back Washing Instructions
Because of the sizing that's added to these fabrics, you want to wash them before you use them. Washing the sizing out will make the backings softer and easier to work with. Wash each back separately in cold water with a little softener or detergent added. Dry them half way (they should still be damp) and throw them over a bed to dry the rest of the way or hang them to dry.
You should expect that the backings will shrink about 4" on each side when they are washed.
How Soft Will My Backings Be Once They Are Washed?
The darker colors will be stiffer even after they are washed. Because they are so saturated in ink, they are similar to batiks in the way they feel and quilt.
The lighter colored backs will feel like brushed cotton or flannel after they are washed.