I'm a fabric snob when it comes to charity quilts becasue they are going to kids. Everything is 100 cotton from top, batting to the back. I used poly batting one time and didn't like it. I used the bamboo ans didn't like it either so I just stick with cotton. Now the fabric comes from all different places and are better than others but all will be used. I pass the cotton blends and things onto others on this board so it is a win-win situation.