The tubing is pretty thin. It doesn't prevent the clip from closing because it slides over the bottom prong of the clip, which is bare. It really works in my dd's fine baby hair, plus the great part is you can hardly see it! I would prefer this to the stick-on, personally. Imagine a straw being slid over the bottom prong, but it's flexible. Maybe that doesn't make sense. Anyway, that's more what it's like. I'll post a pic here in a second.