Warmth and durability for any season! The SOL Thermal(TM) bivvy&';s metalized non-woven fabric provides waterproof protection from the elements while reflecting 80% of your body&';s heat back to you. The SOL Thermal(TM) 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. Stay WarmReflects 80% of radiated body heat. All-season DurabilityHard-wearing SOL thermal fabric resists punctures and tears through heavy use. Climate Control is StandardAdjustable side venting enables you to let air in to cut condensation or batten down the hatches in nasty weather. Lighten UpRated to 50 degrees Fahrenheit as an ultra-light warm-weather sleep system.