Coping is essentially the frame for your pool and it consists of two parts: the outer coping is the concrete or stone around the edges of your pool and the inner coping, which is the part facing the inside of the pool.
Inner coping has a track to lock in the liner. If you look at a pool carefully, you can see a white stripe near the top of the pool’s wall. Some pools have a double track, with the second track being there to hold the winter snap cover.
Outer coping can be made out of different materials, but the most frequently used ones are concrete or stone and each one has its advantages.