Tonight is the night when University of Arizona students strip down to their underwear and run across the mall.
Student leaders are expecting this year's Undie Run to rival the ASU event, which regularly attracts 14,000 nearly naked students.
UA students will "Bare Down" beginning at 6 p.m. for music and games. Running begins at 6:30.
The clothes they strip off will be donated to homeless people.
Things to know: No alcohol. You can't be naked. It will be about 65 degrees at 6 p.m.
You can buy that pictured bikini at the Pac 10 store. Here's what last year's event looked like:
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