Product review (5 stars): This is perfect!!
This is perfect!!! Way better than the cheap foil ducts and the semi rigid aluminium.  The cheapie foil slinky ones are dangerous and a hazard for families because in a fire they burn very quickly.  The semi rigid aluminium is tough to work with and they can crack and break as well. This DryerFlex hose is the best of both worlds, durable and flexible, nearly fire proof. Ducts should be cleaned at least once a year ideally twice.  With regular maintenance and this DryerFlex hose you can rest assured that your family will be safe and not a statistic  of the thousands of dryer fires that happen every year.

https://www.youtube.com/watch?v=kbagQ71JmRA