Which pond liner is the most flexible for installations with tight corners?

For the utmost flexibility, EPDM is the winner because of its soft, rubbery feel. However, EPDM is also the easiest liner to puncture due to its lower strength and puncture resistance. As a result, greater care is required when using EPDM. The Premium Plus EIA liner is the second most flexible option while being many times stronger than EPDM. It is the best of both worlds since it is still fairly flexible but much harder to damage during installation than EPDM. RPE is also much stronger than EPDM, but it is a bit stiffer. For installations with tight corners and shelves where higher strength is desired, the Premium Plus EIA liner is the clear winner, with the Premium RPE 30 mil liner coming in a close second.