Thermo-Lite material is waterproof but not breathable. For access it has 3"-long Velcro patches at 9" intervals along the top and half of one side. It has a 3" by 6" mesh window at the bottom to allow ventilation and control condensation buildup. It comes with a heavy-duty nylon stuff sack that weighs 0.7 oz and so adds 10% to its weight. The stuff sack has a mesh base to drain water and make it easy to confirm that the bivy sack is inside.
Construction The Thermo-Lite material is a soft, waterproof, windproof fabric. It is made from four-ply non-woven polyolefin and vaporized a
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