The Escape Pro Bivvy evolutionary material provides dry, warm comfort you can trust. Engineered to be breathable, waterproof and heat reflective, the Escape Pro allows condensation to escape while keeping the elements locked out and the heat in. Use it as a protective barrier for your sleeping bag and add 15F of warmth by reflecting 90% of your body's heat back to you. On evenings above 50F, leave your sleeping bag at home and travel ultra-light. At only 8oz and with its compact design, its one little bivvy you can depend on.