All Noise Control Soundproofing Blankets are engineered specifically to withstand the most rigorous outdoor and industrial environments. Water, moisture, humid salt air or salt water, dirt, dust, constant ultraviolet light, chlorine air, grease, corrosion, and most harsh chemicals are not a problem for this wonderful product. Soundproofing outdoor sound blankets are washable with a hose, very durable, long lasting and usable in hundreds of areas and applications. Soundproofing Blankets has an incredible NRC of 1.00 (Noise Reduction Coefficient), Acoustical Laboratories test results.