"When camping in winter or humid environments, moisture in the air can dampen the outer layer of your hammock underquilt. The underquilt protector acts as a barrier, effectively blocking water vapor and allowing it to condense on the protector's outer surface instead of permeating your underquilt. This essential function helps retain more warmth and keeps your underquilt clean and dry throughout your camping adventure. Additionally, the underquilt's wind resistance feature aids in preserving heat that would otherwise be lost to the wind."
 
Comes with a stuff sack.