I use Kozy coats. Once I developed a technique for filling them, installing them over plants and later lifting them off the plants, I found they do a good job of allowing me to plant out tomatoes with great success four to six weeks earlier than my avg last frost date. I get ripe tomatoes a month earlier than if I didn't use the water walls.
I have a few pics on my facebook page
https://www.facebook.com/media/set/?...2518947&type=3