Patrice may have the answer!!
I recently purchased 115" backing from them for my 108" quilt, I also washed and dried mine (hot water, hot dryer - like I always do), then pressed it and folded it and brought to the long armer with my quilt. Good news is that my quilt is back and I can see that the backing was indeed wide enough.
Sorry ... I don't remember what brand name my fabric was. When I get home tonight I'll see if there is something printed on the selvege as I haven't trimmed it to bind yet.