See Last Picture for a Stain. Get ready for the game with these NFL Reebok Officials Referee Uniform Knicker Pants. Made for men in size 38, these football pants feature a white and black striped pattern that will make sure you look official on the field. With the Reebok brand, you know you're getting quality activewear pants that will keep you comfortable and stylish during the game. Perfect for any occasion, whether you're refereeing a football match or just going for a workout, these pants are a great addition to any activewear collection. Players Warm Up Pants 100% Polyester.