Waterproof and Thermal Reflective - Stay warm and dry with the waterproof and windproof material that reflects 90% of body heat; XL Bivvy Design - The larger version of our best-selling emergency bivvy, the XL is big enough to shelter two people in an emergency while weighing only 5.8 oz; Emergency Whistle - Signal for help with the attached rescue whistle; Tinder Cord - Start a fire with the tinder drawcord on the included stuff sack; Durable, Reusable, and Quiet - Quiet, tear-resistant material won't shred to pieces if punctured or rattle in the wind; 60-Day Satisfaction Guarantee