2,270 people stripped to their underwear and ran through Salt Lake City to protest what they called the "uptight" laws of Utah - setting the new world record for the largest gathering of people wearing only underpants/knickers.
The previous Guinness world record for the largest gathering of people wearing only underpants/knickers was achieved by 547 participants at an event organised by the PIL Rally Club (UK) in Weston-on-Trent, Derbyshire, UK.
Guinness World Records also recognized the world record for the largest underpants: they measured 20 m (65 ft 7 in) across the waist and 12 m (39 ft 4 in) from waistband to crotch and were presented by Pants to Poverty (UK) in London, UK.
Undie Run organizer Nate Porter says the goal of the event was to organize people frustrated by the conservative nature of the state's politics. Nudity was prohibited by organizers.
Participants donned bras, panties, nightgowns, swimwear or colorful boxer shorts - and some added political messages by expressing support for causes like gay marriage on their chests, backs or legs.
Utah Undie Run organizers are planning another run next August. The event's goal is to protest the state's conservative politics.