Adventure Medical Kits 0140-1223 SOL Thermal Bivvy Sack. Warmth and durability for any season! The SOL Thermal 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 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. Weight: 9.1 oz. Size: 36" x 84".