I tried to think of the positive features of these so with that in mind:  if you are planning to use these just to store your boots away for a season or two, these are acceptable.  The less positive:  First, they are a very hard plastic, sharp-edged item. To get them into your boot you have to use some force in "rolling" the black panel into a tight enough curl to insert it into a boot.  For a ladies knee-high leather boot, zipped up, that can be a pretty tight curl.  Second, I worried that those sharp edges of plastic were going to snag and rip my inner boot linings, both putting in and taking out.  I give them three stars for some functionality, but if you are wanting something to put in and out of your boots once or twice a day to keep them neat and upright - go for something else where you won't torque your wrist trying to curl it up tight enough to insert,  and won't risk ruining your boot's lining in the process.