David Rush, a 41-year-old from Boise, Idaho, set a Guinness World Record by wearing 125 shirts during the Idaho Potato Marathon. Rush finished the race in 5:54:50, beating the six-hour cutoff. His support runner grabbed ice to prevent Rush from overheating, which could have led to hospitalization.

The record-breaking attire took about 30 minutes to put on and weighed around 43 pounds by the end of the race. Rush's crew helped manage his overheating by spraying him with water and packing him with ice. The extreme heat and weight caused severe chafing, leaving Rush with bloody marks. Read more culture coverage.

Rush, a STEM-education advocate, uses his record attempts to inspire students. This marathon record is the hardest of his attempts, according to Guinness World Records. To beat the record, a runner must endure more heat and wear even more soaked cotton. Related: Olympic Sprinter Hosts 5K to Support Rwandan Children's STEM Education.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.