Ryan Harris and Stephen Lyle measure the University's cleanliness with the bottoms of their feet.
Harris and Lyle go everywhere barefoot - classes across campus, through their dorms and restaurants.
They say the University has dirty days that can measured by the appearance of the bottom of their feet.
"Today," Harris said, looking at the bottom of his right foot. "Today's moderately dirty."
After awhile, he said his feet get pretty dirty.
"When I step into the shower, all the water starts turning black," Harris said. "It's kind of gross, but everything has its drawbacks."
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Lyle and Harris said they have spent most of their lives barefoot.
"I've never liked shoes," Harris said. "My parents put them on me, and I would take them off."
Lyle said if people haven't been walking around barefoot all their lives, it can hurt. He said some places in New Mexico are not so friendly to feet because of stickers and cacti.
Harris said he didn't even know what a goathead was until he stepped on one, but that wouldn't make him slip on a pair of shoes.
The two met in the Coronado dormitory.
"I was walking by him one day and was like, 'What? You're not wearing shoes,'" Lyle said.
They jokingly say they are two members of BWA or Barefoot Walkers of America, a club they are trying to on campus.
But some people just don't have the calluses for it, they said.
Harris said his calluses are so thick he accidentally walked through glass and didn't even notice.
His girlfriend thinks it's funny. She won't step into the dorm without shoes.
"She thinks it's dirty, and she'll get diseases, which happens sometimes," Harris said. "I've gotten hookworm four times when I lived in Virginia."
But, Harris said, she's getting better, because she only wears sandals.
The sign "No Shirt. No Shoes. No Service," displayed in restaurants and stores doesn't deter them.
"I pause a little, then figure I'll go in with no shoes and see what happens," Harris said.
Lyle said he carries a pair of shoes with him, and Harris carries a pair of moccasins, just in case they get into an argument with managers.
"After a while, you learn where you can and can't wear shoes, but it's rarer to find places that won't let us come in," Harris said.
They said they run into the most trouble at La Posada and at the corner store in the Student Residence Center.
"Some people are weird about it, but my feet are just as clean as everyone else's shoes, if not cleaner," Harris said.
Places off campus never give him problems, he said.
Harris said people wear shoes because of social pressure.
"It's what they're used to," he said. "A lot of it's trends."
Lyle owns three pairs of shoes: dress shoes, Converse and boots. Harris has two - moccasins and hiking boots.
"I've never had to wear dress shoes," Harris said. "I went to my cousin's wedding barefoot."
There have to be severe conditions to make them put on a pair of shoes - if their feet will be physically harmed or if a job requires it.
"We're not crazy," Harris said. "If it's snowing or if we go hiking or if employers require it, we'll wear shoes."
Harris said walking barefoot is healthier, because it better aligns the back.
"I recommend everyone try it," he said.
