YES! ThinLine pads are made of an open-cell foam. Just look at the air and water!
Foam that is breathable. While the material may look like a solid piece, it is comprised of millions of little open cells so that air can pass through. The open cells are laid out end to end and then the next layer is put down in a different direction. This means the airflow moves laterally across the pad, venting the air out from under your saddle.