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The 84 x 36" SURVIVE OUTDOORS LONGER THERMAL BIVVY from Adventure Medical Kits is made of extremely durable metalized non-woven fabric that resists punctures and tears, while radiating 80% of your body heat back to you for warmth. Adjustable side venting lets air in to cut condensation and allows you to modify for varying temperatures. Offering more versatility than traditional emergency sleep shelters, this bivvy can serve as a rugged stand-alone outdoor sleeping system in warmer weather. Lightweight and compact, it is an easy choice for your next camping trip.