Overlap pool liners are easy to identify as they simply go up the inside of the pool wall and hang over on the outside, leaving several inches of excess vinyl visible. These liners are held in place with strips of plastic called liner coping strips. Overlap liners are the most affordable pool liner and can come plain or decorative and in various thicknesses. Overlap liners are made to fit 48" 52" or 54" pool walls. Note: Always replace cracked or old coping strips to ensure a tight secure fit.