Taking the top cover to the next level we have integrated the side car. Sewn into the top cover near the vented end you will have easy access to all of your important gear. It will be completely reversible which will allow you to change your lay direction from head left/feet right to head right/feet left. The fabric is our proprietorially-designed ARGON 90. It is breathable yet wind resistant. It will help keep your body heat in, creating a micro-climate inside your cocoon of warmth. The vent is designed to not only allow the moisture of your breath to exhaust, but also to give you a window into the world.