Ban-Roll - 1 Inch Width
Ban-Roll - 50 Yard Rolls - Various Widths
Banroll, Monofilament Stabilizer, Armoflexxx - they're all the same (in my book).
First introduced to this product as "Armoflexxx" in Pants for Any Body by Palmer & Pletsch, I've used it in my dressmaking and all my own garments ever since. It bends with you, yet pops right back up for a crisp, clean, firm waistband.
You can also use it in conjunction with elastic for part of your waistband for a bit of 'after-dinner growth".
My directions for using, AND combining with elastic come with your order for 5 or more yards.