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Tim Laramy, left, and Jack Craig dressed in ties carry their tubes as they finish riding Boulder Creek during Boulder's Tube to Work Day, July 15, 2014.
It's a mode of commuting that is being called the "most Boulder thing ever" -- going with the flow on an inner tube.
Wearing business suits and helmets, about three dozen first-time and experienced tubers floated in inflatable tubes in Boulder Creek today for the seventh annual Tube to Work Day.
There were about twice the number of people who tubed on the creek compared to last year, the Denver Post reported. The event started when two friends tubed to work on the creek in 2008, the Post reported.
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Quayle Hodek, dressed in a suit and tie, floats down Boulder Creek during Boulder's Tube to Work Day, July 15, 2014.
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Jeff Kagan is the founder of the seventh annual Boulder's Tube to Work Day, July 15, 2014.
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Quayle Hodek, dressed in a suit and tie, floats down Boulder Creek during Boulder's Tube to Work Day, July 15, 2014.
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Jeff Kagan, left, is the founder of the seventh annual Boulder's Tube to Work Day, July 15, 2014. Around 40 participants took their tubes down Boulder Creek on their way to work.
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Quayle Hodek, dressed in a suit and tie, hops back on his tube during Boulder's Tube to Work Day, July 15, 2014.
RJ Sangosti/Denver Post via Getty Images
Jeff Kagan, right, is the founder of the seventh annual Boulder's Tube to Work Day, July 15, 2014.