A drawstring footbox is a bottom closure at the foot of a sleep system that has a drawstring that can be opened up. This can be a nice feature for some people. First off, it provides a venting option. If a sleeper becomes overheated, all they need to do is reach down and open the drawstring to provide airflow or even stick a foot out. Second, this type of footbox can allow the user to literally get up and walk around in their sleep system by opening the drawstring and slowly shuffling or by pulling the bottom up around the waist for more freedom of motion. Getting into your sleep system can sometimes be the highlight of the day. For folks who have camp chores to do this means being warm and cozy as soon as you get to camp instead of waiting till bedtime. It also means that in the morning, when you're warm and cozy, instead of crawling out of your nest, you can simply open the cord and stand up. You can stay in the warmth while you move about and take down camp or make breakfast. There is often a misconception in the outdoor community that this type of closure is less warm than a typical sewn footbox. Actually this method ends up with more down insulation cinched into the footbox area than a sewn footbox. I believe this misconception came about when no draft collar or plug was used to fill the tiny remaining hole. In that case there is an obvious air transfer problem despite the increased insulation. I use a full draft tube that completely seals the space and the draw cord hole.