Hi Keeper, fellow Texan

+1 about the drafty. That being said there are many shoe cover options that will fix that problem. Since TX is very hot for part of the year having a shoe that breathes well is a benefit during those months.

Be careful of the Pearl Izumi tri shoes with a single large tab for closure. My coach has them and is constantly annoyed that they are coming un-velcroed during riding. My Sidi road bike shoes as well as Sidi mtb shoes have never done that. So, just be careful if you're looking at the PI shoes.