Pondmaster Super-Flex is a flexible polyethylene-based pond liner that combines the strength of Polyethylene liners with the highest flexibility available. This 12.5’x15′ liner is fish-safe and is deal for medium to large koi ponds, aquatice habitats, water gardens and waterfalls. Super-Flex is insect resistant, making it perfect for residential and commercial applications. Super-Flex is half the weight of traditional EPDM liners but more flexible.