Swimline pool liners are made of virgin vinyl, with super strong double welded seams for long winter, and hot summers.
Protected against chemicals and UV fading
Overlap liners basically hang over the side of your above ground pool wall.
Secured with Pool Coping Strips that hold the liner in place (not included).
For overlap liners, even though they are labeled 48"/52" depth, per the manufacturer they can stretch to accommodate 54" above ground pool walls with constant depth floors.