After doing a little research...Woolies II Flannel 10" Squares by Bonnie Sullivan for Maywood Studios is 100% cotton flannel designed to look like wool. Flannel must be pre-washed on a warm or hot water temperature and high heat dry; it also means, 2-6 inches of shrinking will and could happen, so you should by extra to allow for the shrinkage and have enough to finish your project...

when I use cotton flannel, I buy yardage...it's easier to wash and I then cut my pieces.....it saves a lot of grief that way....