Anyone who complains about hot feet while in sneakers/running shoes, there are two suggestions that might help:
1 - Get rid of your cotton socks. Seriously, throw them away. They do not breath and just hold moisture. Get socks comprised of no more than 2% cotton. They are thinner, lighter and wick sweat away from the body helping prevent blisters and keeping your feet cooler. They can be found just about anywhere now. Academy, Dicks, Target, I THINK even Wal-Mart. Even youth sports teams have moved away from cotton now it has become that common.
2- Get a pair of shoes specifically designed for running. There are some differences in support between walking and running shoes, but they are MUCH better for your feet than a standard leather sneaker from 1985. You want something that is made to help your feet breathe.
Here is an example of a current walking shoe by Brooks:
Now here is a running shoe by brooks...see the side and top panels which allow for more airflow:
When trying to decide which shoe is right for you, I cannot stress enough to go to a specialty running store...at least once. They will do a gait analysis on your feet and watch you walk then be able to suggest the right shoe for your activity. Then, can also recommend any insert that may help a specific condition you have concerns about. After that, feel free to scour
amazon or running warehouse for online deals on replacements, but seek the advice of a professional (and I don't mean an employee at Academy).