Experts say the best way to stay cool and avoid overheating is to stay in the air conditioning, but some people don't have that luxury.

That's especially true if their job requires them to be outside, like a U.S. Postal worker.

"You just keep going, one foot in front of the other," letter carrier Mark Davis said.

That's how Davis said he gets through the day, a day that includes walking between seven and eight miles, up to 12 hours a day, not to mention carrying a 40-pound mailbag.

"When you get done at the end of the day, you're drained. You've had it when you get home," said Davis.

But it's all part of the job, he explained.

"Really, you just have to go, like the old creed, through rain, sleet nor snow, you just got to go," he said

On days like Friday, postal employees are given safety talks on how to deal with the outdoor elements. Most important, officials tell their employees to do their best to keep hydrated.

"I feel sorry for them because even though that's their job, but they come out in the freezing cold in the winter. Sometimes it's below zero with the wind chill factor (when) they deliver," said Postmaster Anita Petrella. "Then they come out in the heat and most of these guys are just used to it, and they've developed a position where that's what they do and they just do it every day."

Aside from the outdoor elements, Davis said the uniforms aren't the coolest, and the mail trucks don't have air conditioning.

But Davis said after 26 years of being a postal worker, he is thankful to have a job, and aside from an ice cold glass of water, he only has one other thing on his mind.

"I'm thinking about quitting time. That's basically it!" said Davis. "Just waiting to get done for the day."

The Steubenville postal route is an all-walking route, which includes up and down stairs.

Davis said he takes advantage of the shade as much as possible, but he really appreciates those customers who leave a bottle of water out for him on days when the heat is overwhelming.