Why the Cowboys' helmets have a red stripe for Week 9 game vs. Broncos

Dallas has added a red stripe to its helmet for its Week 9 game against the Broncos. Here's why the Cowboys have done that.

source https://www.sportingnews.com/us/nfl/news/cowboys-helmet-red-stripe-broncos/15rk119nnshp318flh52zkbzrz