Last we checked, ice cream is supposed to melt if it isn't kept chilled.

But Walmart's store-brand ice cream sandwiches don't even melt in the sun, according to a report from WCPO Cincinnati.

The discovery was made by a local mom, Christie Watson, who noticed that a Great Value ice cream sandwich her son left out on their patio table hadn't fully melted -- even though it had been sitting out for 12 hours on an 80-degree day. Watson left a second ice cream sandwich out overnight with the same results, WCPO reports.

"What am I feeding to my children?" she asked, appalled.

“Ice cream melts based on the ingredients, including cream," Walmart spokeswoman Danit Marquardt said in an email. "Ice cream with more cream will generally melt at a slower rate, which is the case with our Great Value ice cream sandwiches."

But as Business Insider reports, the product also contains a number of additives:

According to Wal-Mart's website, the ice cream sandwiches contain milk, cream, buttermilk, sugar, whey, and corn syrup. It also contains "1 percent or less of mono-and diglycerides, vanilla extract, guar gum, calcium sulfate, carob bean gum, cellulose gum, carrageenan, artificial flavor, and annatto for color."

WCPO conducted an experiment of their own, leaving out a third Walmart sandwich alongside a Klondike bar and a pint of Haagen Dazs ice cream. The Haagen Dazs ice cream -- which contains only cream, milk, sugar, eggs and vanilla, and no gums -- melted fastest. The Klondike bar melted, too.

"The Walmart sandwich, though it melted a bit, remained the most solid in appearance, and still looked like a sandwich," the station reported.