"The Ridgerunner underquilt protector is a great accessory for the Ridgerunner hammock. It blocks wind and windblown moisture, which can be hard to do with a tarp alone. Blocking wind from an underquilt (or any down item) is crucial to getting full warmth out of it. It will allow you to go with a smaller, more manageable tarp while still maintaining a 100% windblock, and it can be left in your pack or at home when not needed. A small or medium size tarp plus an underquilt protector gives you the most versatile setup for year round conditions."

Above wording from Brandon at Warbonnet Outdoors.
 
Our take on it: it's Warbonnet; it won't let you down. Sold in an Olive Green colour.