The outer fabric is 100% cotton batik,
inside are 2 layers of 100% wool batting,
quilted to 100% cotton muslin.
Click on image to see enlarged view.
Being handmade, not one is perfect.
No two are exactly alike.
Keeps your beverage steaming hot or icy cold for about an hour.
The images show that each size has a slightly different shape to accommodate its intended vessel.