Hello David, thank you for the compliments. The coping is a natural limestone tile. That material works well with salt water pools (pool in photo is salt water as well). We don't have any experience installing this tile in an environment where it freezes in the winter, however, since it is a natural stone we don't imagine there being any issues.
If you would like to get more information on the product, you can contact the supplier directly and they can get you more information regarding durability in freezing temperatures.
Altera Landscape
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