UIL uses wet bulb temperature to determine whether to practice
The NFL's Ridiculous Uniform Policy, Illustrated - Battle Red Blog
Examining the NFL's uniform rules - Land-Grant Holy Land
NFL Cheerleaders on Many Teams Must Abide by Strict Rules
Rules you probably didn't know NFL players have to follow
NFL Health and Safety Fact Sheet
NFL Football Uniforms Rules Guide
What Do NFL Players Eat for Breakfast?
NFL Rules Players Must Follow