Product review (3 stars): Thin But Reasonable
This is made of soft material and I used it to replace a rigid set of duct work that I had in place already.  It tears easily and in fact already shows some signs of tearing just from the install.  Although it is eight feet, it sure does not seem that way... so make sure you get enough length for your application.  I do not feel confident that it will last as long as the original rigid set I had. Also, be sure to use duct/dryer tape along with it else it will never stay connected.