The SOL? Emergency Bivvy is ultra-light, ultra-warm, full-protection shelters that professionals rely on, in emergency situations. It's made from the same heat-reflective polyethylene as Adventure Medical Kits world-famous emergency blankets (reflecting 90% of your body heat back to you), with the added benefit of being fully sealed so that no wind, rain, or snow can get inside. If you're forced to spend the unexpected night outdoors, hop into the Survive Outdoors Longer? Emergency Bivvy as soon as the temperature drops, and instantly improve the odds in your favor.Sealed on the sides for full protection from rain, wind, and snow. Heatsheets? material is waterproof and windproof. Reflects 90% of radiated body heat. Size: 84"x36". Wt. 3.8 oz.