HI mom of 4
I relate to your missing sittting next to the ocean's edge with your feet in the water!
As part of their wetsuits, surfers wear what are known as "booties' on their feet. They are soft and rubbery and provide insulation from the cold!
Maybe they could work for those peaceful times in a beach chair along the ocean's edge, or in pool that's less than 93 degress.

Hope4thebest xoxoxox