Some manufacturers make bivy sacks designed to be more comfortable than basic emergency shelters. These include breathable materials, more room, and sometimes even small support poles and bug netting. This is not that kind of bivyits a true, original emergency shelter that blocks wind and water instantly and doesnt even attempt to let sweat escape. The Bivibag Ultralight packs down to a very small size and can be a lifesaver if you or someone else needs extra protection from wind and rain in worsening weather or after an injuryin situations where you're waiting for rescue or for the night or bad weather to pass. The nature of the product is reflected in the fact that the manufacturer notes it can be reused, provided it is handled with care. - Foil-type material with a polyurethane film and reflective aluminized interiorfully waterproof, fully windproof, and reflects body heat - ClimatePartner-certified product This product contains no PFAS compounds. Note! This is n