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The Bolder Boulder is the 2nd largest 10K in the nation, drawing over 50,000 participants every year over Memorial Day weekend. The concept behind the 2016 race t-shirts was an integration of the American flag and the iconic Boulder flatirons. The illustration itself shows the flag in perspective with the upper stripes merging into the flatirons in the background, while the lower stripes merge into a road in the foreground.