The Potomac is the first commercially available hammock underquilt with synthetic insulation. My goal in creating it was to achieve the warmest product for the lowest possible durable weight. To achieve this I use the highest quality materials available and focus on an exceptional fit. To minimize weight and cost, the insulation is held in place with 100% polyester quilt loops.

It uses full perimeter elastic which is adjustable at all four sides. This allows for a fully customizable fit that eliminates drafts in cold weather and allows for ventilation when it's warmer out. Each perimeter shock cord uses a sewn-in cord lock allowing one-handed adjustment. The Potomac is shaped to fit a Hennessy Ultralight Backpacker Asym, but will work with any model. Let me know if you have a large hammock. Two small loops need to be added to the head end attachment cord.

Attachment

Attaching the Potomac to your hammock is extremely quick and easy. All attachment cord is elastic and is fully adjustable for height and length. Depending on the weather, it can be set up in one of two modes. For colder weather, each end of the underquilt is clipped up and over your hammock ridge line. This creates an excellent bathtub-style fit that wraps it up and around you. In warmer weather, the end corners can be left down. Side loops can be threaded through Hennessy side tie-outs for a close fit without the wraparound warmth of the cold mode. I am currently working on a design that will allow full use of the cold mode with Speer or other non-ridgeline hammocks. Check back soon for pictures and results.

Stuff sack

I've never liked having to jam quilts or sleeping bags in stuff sacks that just barely fit. Another disadvantage is that that kind of stuff sack winds up hard to pack because it turns into a rigid ball. I've been using larger ones that are easy to stuff. Even better, you can still mash them down when you need the space, but they also allow your quilt to loft more when you don't.

XL stuff sack allowing full loft	XL in green.	Stuff sack still compresses easily inside your pack if you need the space

Will I be trapped in my Hennessy?

I get asked most about entry and exit with Hennessy hammocks. All attachment points on the Potomac are elastic. To get in, just slip it to one side, sit down and pull your legs up as normal, then slide it back into place. It will snap right back. Do the reverse when exiting. This is a valid concern, but no one has had the slightest problem after actually doing it. I slide a foot out of the opening to slide it aside when exiting and it's something I don't even think about.

How cold can I go?

I go back and forth on posting temperature ratings because of how subjective it can be. The short answer is that you'll almost certainly be very comfortable down to 30F. I sleep pretty warm and am comfortable down to the mid-20s wearing polypro tops and bottoms and a fleece hat. I'm working right now on delving into all of this a little more deeply. I'll post a link when it's finished that will give some more information about temperature ranges, staying comfortable, etc.

Size and weight

Two sizes are available. Size regular fits about 5'9" to 6'4", size small fits below 5'9". The sizes are roughly suited to men and women. If neither of these sizes seems quite right or you just want a custom model, let me know and we'll work it out for the same price. Each size is about 48" at the widest point. Average weight for the large is 28 oz. and small is 24 oz.