I'm sure some of you have tried using a car windshield heat reflector as a lightweight summer pad. Much like using any pad you run into problems with adjusting them while your on top of them, sliding around, etc.
There are many solutions to this problem. The knotty mid helped me keep all my gear in my hammock nicely, but still my pad kept moving around and adjusting it whilist I was on top was quite annoying.
Sewing it into my fleece mummy bag has been a great solution. It also seems to insulate slightly better. I added an extension at the bottom that wraps up over my feet creating a foot box. Also the bag seems to force the pad to wrap around my sides more eliminating the need to carry side pad extensions.