Presumably they get washed between games
Patrick Mahomes admits he wears same underwear every game - Los Angeles Times
Patrick Mahomes Confirms He's Worn the Same Underwear for Every NFL Game Since Rookie Year: 'I Wash 'Em
Patrick Mahomes Wears Same Underwear for Every Game, Says Chad Henne
Patrick Mahomes Wears The Same Red Underwear Every Game
Patrick Mahomes Wears Same Underwear for Every Game, Says Chad Henne
Patrick Mahomes admits he's worn same underwear every Chiefs game since 2017
Patrick Mahomes admits he wears same underwear every game - Los Angeles Times
Patrick Mahomes Wears Same Pair Of Red Underwear On Chiefs Game Day
Patrick Mahomes wears the same pair of underwear for every NFL game