By John McDevitt

PHILADELPHIA (CBS) – It’s not everyday you see 400 men and women running around outdoors in their underwear, but that’s exactly what happened Saturday in Philadelphia. Philly is one of several cities in the country that held Cupid Undie Runs benefiting a children’s charity.

Some dared to bare more than others.

“I got my undies on and I got my little bra on,” this runner said.

“I am wearing a fox fur and underwear and pumas and that’s it,” said this runner.

With temperatures in the low 30′s, people were shivering, howling, jumping up and down before the start of  Cupid’s Undie Run in the Fairmount section of the city.

More than $50,000 was raised in Philadelphia for the Children’s Tumor Foundation.

Wearing just boxer shorts, Dan Frienya of Doylestown helped organize the Philly effort.

“My son has NF1 and that’s why we do this,” he said “He has an optic nerve glioma and instead of sorrow we celebrate and this is why we are here.”

Sixteen other cities also held runs. The nationwide fundraiser brought in more than $1-million.