One question I get a lot is whether it is ok to use fleece in place of interfacing or cotton batting. The answer is "yes". I hadn't used fleece before, but knew other people had been using it successfully. The topic kept coming up, so I decided it was something I needed to try myself.
This pouch is my first project using fleece and it turned out really great! It was very easy to sew.
So here is my comparison of fleece and cotton batting. Keep in mind that I used sew-in fleece and not the fusible fleece. I'll try fusible fleece soon.
Cost
The cost difference is so slight, I'd say it probably isn't worth making a decision based on cost alone. I calculated the cost per square inch of each to get a good comparison, and they were all less than a penny per square inch:
Sew-in Fleece: $0.0031
Cotton Batting: $0.0035
Fusible Fleece: $0.0044
Sewing
The fleece is pretty stretchy. As I was sewing, I found
it would get stretched past the edges of the fabric, sometimes
concealing them. Since the pouch was small it didn't really interfere
with being able to keep an eye on my allowance. On larger items, it might get in the way more.
Cotton batting also has quite a bit of stretch, but the fleece seemed to have about twice as much stretch.
The fleece is easier to sew through than the cotton batting, since the fibers are not as dense and tightly packed.
Another nice thing about the fleece is it doesn't shed fibers as much as cotton. Sewing with cotton batting dulls my needle pretty quickly and gunks up my machine with tiny fibers.
The fleece also has a certain puffiness that fills out
the space between the fabrics nicely. I'm very pleased with how this pouch turned out. It feels padded, but light.
Ingredients
Fleece is made of polyester, so basically it is made of oil. From what I understand, the polyester fibers are sprayed with acrylic resin that bonds the poly fibers together.
Cotton batting is made of mostly cotton, but even though the package says 100% cotton it might also includes a layer of polymer fibers in the center. The cotton fibers are punched with hundreds of needles, which intertwines the cotton and poly fibers together to create the batt.
Warm & Natural batting (which I love) uses this needle punching method with the polymer layer.
I've also used Dream Cotton from Quilters Dream, which really was great to sew when I made this quilt. The package says it is needle punched, but I don't see any mention of polymer on the packaging pictures I've seen online.
Conclusion
Hmmm...I'm leaning towards sticking mostly with the cotton batting. Fleece is a bit too chemical intensive for me, but the cotton probably isn't much better. Even though it is a natural fiber, cotton is grown using a lot of pesticides and fertilizers made from petrochemicals.