[Waterproof and Tear-Resistant Oxford Fabric] The IBC cover tarpaulin is made of heavy-duty oxford polyester with a thick PU coating and waterproof tape. PU outperforms PVC because it is more durable, waterproof and UV-resistant, softer and more comfortable. The 1000L water tank cover has an exterior piping and double-stitched seams to improve strength and tear resistance [Velcro and Zipper Design] To collect rainwater, simply lift the square Velcro on the top of the IBC tank cover 1000L and the inlet cover will be exposed. The outlet side of the IBC water tank cover has a zipper, which can be flexibly opened according to the outlet position to check the water level of the tank [Prevent Condensation] The 1000L water tank cover has 2 large air vents on each side and are designed with mesh lining. The vent promotes air circulation inside the IBC container cover to prevent moisture condensation, which helps keep the tank body dry and extend the life of the tank. [Easy to Clean and Store]