I'm thinking more of the warmer of the four seasons hear....

Small, lightweight, framed mosquito netting for the facial area. I find that most bags with framed mosquito netting tend to over do it.

A good method for keeping rain off the facial area for the warmer seasons when it may be hot and rainy. I hate having to seal myself in to even a 40 degree bag just to stay dry when it's hot enough outside to makes me hot and sweaty inside the bag.