Above ground swimming pool liners are made of a thin vinyl material, and are designed to hold water in your above ground pool. The water inside an above ground pool pushes out against the pool walls and actually holds the walls up. If all of the water is drained from the pool liner, the thin steel pool walls will collapse inwards and be damaged. Swimming pool liners are a functional part of the above ground pool, but also add style and character. Above ground pool liners are available in an amazing selection of attractive patterns and styles, and often set the d