The Adventurers Hammock is not waterproof. The reason being is that to have a truly comfortable hammock you need a material that is highly breathable. This allows the material to fight any pooling of water or condensation during the night. With waterproof material, condensation and water vapors will pool on the inside of your hammock that will actually wet you and your gear - allowing for the perfect place for mildew to form. With this all said, The Adventurers Hammock is made with 100% nylon parachute material, which is amazingly strong, breathable and actually mildew resistant.