The PVC pool cover is made from high quality, UV-stabilized PVC fabric with aluminum poles running across the width of the pool. The poles act as support, keeping the fabric above the waterline and ensuring that nothing on top of the cover falls into the pool. The cover is fastened down by means of a stainless steel ratchet system on the ends of the cover. Pole pool covers are perfect for protecting your pool from dirt and leaves, preventing water evaporation, preventing children and animals from falling into the pool, and increasing the temperature of the water, allowing you to extend the swimming season. What you will receive with your Pole pool cover: 600g of special-formulated pool cover PVC fabric, aluminum poles (the number of which is subject to the size of the pool), stainless steel (not nickel plated) ratchets and fittings, 2-ton breaking strength webbing, and a cover that can carry up to 220KG. Drainage holes allow for water to flow into the pool.