I've been told even using all cotton batting in the cozy, it could catch a fire as they may not have used all cotton thread. I just don't take a chance with it catching fire and will transfer the bowl on to the cozy after it's out of the microwave. Rather be safe than sorry. My house is 122 yrs old so I tell my neighbors if my house ever catches fire........bring out the marshmellows and weinies cause I'm sure the fire dept won't get there in time to save it. We live in a small town so our fire dept is mostly volunteers.