For warmth and durability in any season, the SOL Thermal Bivvy has a metalized non woven fabric that provides waterproof protection from the elements while reflecting 80% of your body's heat back to you. The SOL Thermal BIVVY offers more versatility than traditional emergency sleeping bags the extremely durable fabric resists rips and tears, and thanks to its soft face and aggressive side venting, it can be pushed into duty as a stand alone sleep system in warmer weather. Ideal for outdoor users looking for an emergency shelter that can become a regular part of their gear arsenal. Reflects 80% of radiated body heat so you stay warm. Hard wearing SOL thermal fabric resists punctures and tears through heavy use. Adjustable side venting enables you to let air in to cut condensation or batten down the hatches in nasty weather. Rated to 50 degrees Fahrenheit as an ultra light warm weather sleep system. Size: 84x36. Wt. 8.9 oz.