Pool liners are made of a thin vinyl, and designed to create a water tight barrier to hold water in a swimming pool. All above ground swimming pools require a liner, but there are many types of in ground pools which do not require a vinyl liner. In ground swimming pools that are not built to use a vinyl liner can be adapted to accept a pool liner as an alternative to costly repairs to a deteriorating pool surface or as an alternative to frequent and costly painting. Vinyl pool liners can last 10 years or more in a properly maintained swimming pool. Proper pool maintenance that will extend the life of a pool liner includes correct water chemistry, and taking the steps necessary to winterize a pool and protect against harsh Winter weather. Swimming pool liners are available in several thicknesses and grades to meet the needs (and budget) of any pool owner. Swimming pool liners for in ground and above ground swimming pools are now available in a very wide variety of attractive patterns. Pool liners are very functional, but also help improve the overall look of the swimming pool and may help set the theme of the entire pool area. Follow this link for the best prices on name brand replacement pool liners.