How will the TRANR mats hold up in the sun? I want to put them over concrete, poolside to create a space for stretching and calisthenics. No rain, but lots of sun.

1/4" TRANR Rubber Mats can be used outdoors. They are resistant to the elements and are very slip-resistant, and even more so when wet. They are also mold and mildew resistant. The only thing you will notice is that the mats will fade a bit in direct sunlight, and they will be hot. To keep them cool, we recommend spraying them with water from time to time to keep them cool.