Ultra-Lightweight Design: The Emergency Bivvy XL is an essential component of any survival gear kit, weighing a mere 5.8 ounces for effortless portability Heat Retention: Crafted to save your body's precious warmth, the survival bivvy reflects up to 90% of body heat, ensuring you stay warm in the wild Multi-Functional Use: This versatile bivvy bag comes with an emergency whistle and can be utilized as an ultralight summer sleeping bag, a reflective blanket for emergency warmth, or a tarp to create an impromptu shelter Breathable & Water-Resistant: The compact bivvy is made of innovative material that shields you from rain, snow, and wind Compact Size: When adventure calls, the lightweight bivvy bag won't burden your pack, fitting snugly into any hiking gear or emergency survival kit