This is the Bottom Entry Bugnet. Trevor is the inventor and an avid hiker, diy'r and all around good guy. It is to be used with 10 and 11 foot hammocks. It is one of the easiest ways to get a bugnet on a nettless hammock. There is shock cord on the bottom and a cord lock to cinch it to the bottom of the hammock/ underquilt. They are made from nano-see-um.