I love these so much, I ended up buying them twice.  I have probably 6-8 pairs of very tall boots and these are perfect for ensuring the integrity of my boots.  I also had some booties that come up a few inches above a bootie and I used these for them as well.  I simply used a binder clip to make it slightly shorter and it worked for them as well!  They really hold the air and keep my lovey boots looking great for the next season.