Survive Outdoors Longer Thermal Bivvy w/ Rescue Whistle Orange. Fully windproof and water resistant the bivvy provides extreme warmth and protection with a metallized coating that reflects 80percent of body heat preventing heat loss by trapping warm air against your body while keeping the elements out. The bivvy sleeping bag is durable and resists punctures and tears from heavy use and includes a tindercord drawstring for emergency fire starting with a built-in rescue whistle for emergency signaling. For heat regulation and climate control the footbox and hook and loop closures allow for adjustable ventilation. The multipurpose bivvy can be used as a sleeping bag liner or as a heat-reflective blanket in extreme cold. Specifications for Survive Outdoors Longer Thermal Bivvy w/ Rescue Whistle: Manufacturer: Survive Outdoors Longer Color: Orange Internal Height: 84 in Internal Length: 36 in Weight: 8.9 oz Age Group: Adults Application: Climbing Fabric/Material: Metalized Features of Survive Outdoors Longer Thermal Bivvy w/ Rescue Whistle 80percent Heat Reflective - Metalized coating with up to 80percent thermal heat reflectivity traps warm air against your body. Weather Resistant - Thick durable material is water and wind resistant. Customizable Ventilation - Adjustable footbox and hook and loop closures along top and side openings allow customizable ventilation. Rescue Whistle & Tinder Cord - Includes rescue whistle and tinder cord drawstring for emergency fire starting. Multipurpose Bivvy - Use as a sleeping bag liner or emergency blanket. Package Contents: Survive Outdoors Longer Thermal Bivvy w/ Rescue Whistle Survive Outdoors Longer 0140-1221: Thermal Bivvy w/ Rescue Whistle Orange