I took a class in college called Textiles. UGHH hardest class i ever took. learned fabric type, name, content, story and chemical make up. I had to make little 5x7 cards with all the above mentioned on each swatch (i got an A). We did tests of diff kinds one each type of fabric,,, cotton, wool, poly, etc. I was shocked to find anything made with polyester when heated will MELT!! This means if your wearing anything poly it will melt into you. Same with many man made, polyprolene being one. They melt at a low temp. The higher the temp the quicker the burn and fire. Since then i read all labels on clothes and wont wear polyester. Im glad they finally made a new batting. I will prob use it on all quilts. Ive been thru a house fire and thats scary. Glad no one was hurt tho.