Protective Aerocover for stackable chairs and gas pump chairs This cover is waterproof, breathable and UV-protective. PLEASE NOTE: our range of Aerocovers will provide resistance to water but they are not fully waterproof. If you are covering garden furniture, please do not leave your cushions under cover for prolonged periods of time. We do not recommend covering your furniture in warm weather conditions as this will affect the longevity of the fabric beneath the cover.