"Presenting to you the Breathalizer! Created with the intent to help minimize condensation and redirect your breath back out through the vented top cover. 
 
This will also help in keeping cold air out, keeping you warmer. It is made out of ARGON 90, making it wind-resistant, lightweight and breathable fabric. 
 
The Breathalizer easily attaches to your ridgeline with a mini squeeze hook and then comes down on either side connecting directly to the D-rings on either side of your hammock. We have also incorporated a shock cord and mini squeeze hooks on the sides to help seal up any gaps."
 
The above wording is straight from Dutch and his team.
 
It fits the Chameleon Hammock and other hammocks with suitable D-rings.
 
View a video of it on Dutchware's YouTube channel.