What type of liner to get for their above ground swimming pool — beaded or overlap? There are a few important differences between these two types of liners but . Pool liners come in several types. Let The Pool Factory explain the differences amongst Unibead Liners vs Overlap Liners with this detailed article. There a number of different colors and patterns available, but pool liners mainly come in two types and those are the beaded pool liners and the overlap pool . In this article we discuss the difference between Overlap, Beaded and Unibead vinyl Above Ground Pool Liners. Let's discuss the differences of each liner. Feb 12, 2016 - The four most common above ground pool liner types are the overlap, beaded J-hook/Unibead, and expandable. Find out which is the best for . Determine what type of pool liner you need. Above ground swimming pools are built to accommodate either an overlap style liner or a beaded style liner.