Colorado State University's annual 'Undie Run' is Friday

Undie Run 2023 part 1 Thank y'all for showing up and keep sending

WATCH: CSU students gather after undie run

Undie Run 2019: More than 1K participate in Colorado State

CSU Undie Run 2021 Videos Update

CSU Undie Run Videos: Hundreds Strip, but Attendance Down

Photos: 2018 Undie Run at Colorado State University

Spring 2010: Chapman Undie Run a fun romp – Orange County Register

Colorado State University Undie Run: Students urged to not participate

Undie Run 2015: 'It is a non-profit event