For all of our frameless shower doors and enclosures, the thinnest glass we use is 3/8" thick. Some of the textured glass we have available is only 3/8" thick. We also use glass that is 1/2" thick. For the sake of rigidity and safety, we sometimes recommend this heavier 1/2" glass on larger enclosures or for certain configurations. For more information, please visit  Mr. Glass & Mirror.