This 4Season system has advantages when you find yourself in colder weather than expected. It can be adjusted to a wide range of temperature conditions without adding weight or bulk.  

With just the oversize open cell foam pad, most people are comfortable down to about 40 F / 4 C.  Adding the space blanket under the pad should take you down to below freezing. The  space blanket can be placed above or below the pad depending on the temperature, humidity and what works best for you.

If you have been wearing a jacket during the day, spread it out on top of the open cell foam pad or anything else in your pack that has insulation value such as extra clothing, towel, hat or socks to get you down into the twenties, maybe even lower. The pad can be stowed in the compression sack when not needed or left at home. If it’s a relatively warm night, you may want to let the trapped air space between the two layers keep you cozy.

Also, we have included a 7” / 18 cm diameter compression sack. This allows the hammock and the 40 inch / 100 cm wide insulation pad to be folded in half lengthwise, rolled up and easily slid into the compression sack, pushed down and closed with a drawstring. Finally, the cap is pulled over the top of the compression sack and the straps tightened to about 16” / 40 cm in length.

Please note: The 4Season hammock employs a different storage system. The hammock / foam pad should be stored in the compression sack and the rain fly should be stored in the SnakeSkins. This assures that your hammock and pad will always be dry and your wet rain fly is stored inside the SnakeSkins on the outside of your pack. When you get to camp, first set up the rain fly in the rain, and then move in under the fly to set up the hammock out of the rain.

Patented Features
Tom knew that the people of Central America sleep diagonally in their hammocks. So, with that knowledge, he changed the shape of his hammock into his patented asymmetrical design which lets you lie level on the diagonal with excellent support under your lower back and knees. 

Because tree spacing is always different, the curve of a hammock is always different.  The patented structural ridge line ensures the same shape every time you set up your hammock. This is the first time in history that you have the exact same comfortable bed every night and a perfect setup every time 

 Asymmetrical hammock shape  (US Patent US6865757B2); Structural ridge line patent (US patent US20090165205A1) Also patented in the UK, EU, AUS/NZ, and Canada.

• Height Limit: 6 ft / 183 cm
• Weight Limit: 250 lbs / 113 kg
• Packed Weight: 5 lbs / 2267 g not including free 3 oz / 84 g webbing straps
• Packed Size: 7" / 18 cm diameter x 13" / 33 cm
• Hammock Fabric: 1 layer of 70d nylon and 1 layer of 40d nylon
• Bottom Fabric Dimensions: 120" x 59" / 305 cm x 150 cm
• Mesh: 30d polyester No-See-Um netting
• Suspending Ropes: 120" / 305 cm long, 1500 lb / 680 kg test polyester rope
• Webbing Straps: 1.5" x 42" / 3.8 cm x 107 cm long black polyester
• Rainfly Weight: 25 oz / 710 g
• Rainfly Fabric: 70d polyurethane coated polyester ripstop
• Rainfly Dimensions: Size 363cm/143" on centerline x 304cm/120" wide symmetrical hexagonal shape
• Color: Titanium grey hammock with red lining and titanium grey fly with black trim
• Stuff Sack: Logo and set up instructions printed on black polyester ripstop compression sack with grey end caps and red nylon compression straps 3.4 oz / 96 g

WHAT'S INCLUDED: The 4Season Expedition comes complete with attached mosquito netting, detachable rain fly, support ropes, and compression sack with set up instructions on back. Hennessy Hammock also provides complimentary standard 42" / 107 cm long "Tree Hugger" webbing straps to protect the bark of trees. Because these accessory webbing straps are complimentary, they are weighed separately from the hammock.

The 4Season Expedition also includes an oversized 30" / 76cm wide open-cell foam pad, and a heat-reflecting space blanket.