The SOL Escape Bivvy is a little larger than most emergency shelters, but is still incredibly lightweight. With a water resistant, breathable fabric, the Escape Bivvy allows expired moisture to leave the emergency shelter, rather than making you wet. The inside of the bivvy is heat reflective for warmth retention. The Escape Bivvy is well suited for long daytrips where overnighting is a possibility, but not expected. It is also excellent for patient packaging as a lightweight, weather resistant, breathable treatment bag.