This 45-mil super thick EPDM pond liner (10' x 15') is puncture and tear-proof – resists sharp rocks and root growth; flat surface reduces soil buildup for easier cleaning. UV-resistant, chemical-resistant, withstands extreme weather – ensures many years of use. Flexible – easy to bend and fold to fit pond contours; can be cut for different shapes. For better flexibility, lay in sun for 10-15 minutes. Safe for fish and plants – prevents harmful substances from penetrating water. Versatile for fish ponds, water features, retention ponds, fountains, waterfalls, and water gardens – adapts to various sizes, steep slopes, narrow corners, and shelves.