Evoio Maximum Temperature Hot Handle Holder, Black Pan Cotton Handle Sleeve, Glove for BBQ, Cooking, Baking and Kitchen 2-Pack(Black)

Does this have any teflon or genx coating on them? also typically known as “forever chemicals.” does this have any coating on them of any kind?

Do these work on the Martha Stewart cast iron pans?

It says “heat resistant material.” What is the exact material? Does this have any coating on them? 100% cotton isn’t typically heat resistant.

What country of manufacture?