The NFL fined two players who violated the league's uniform policy to honor their late mothers
Sources -- NFL fines Ben Roethlisberger $5,000 for wearing Apple Watch on Steelers' sideline - ESPN
Titans' Avery Williamson wears 9/11 cleats despite fine threat
FACE-OFF: NFL fines players for uniform violations for causes – troyrecord
The NFL Fined A Player For Wearing Purple Cleats For Domestic Violence Awareness
Smith-Williams to Wear Purple Leash Project Cleats at Commanders-Giants Game
Steelers: DeAngelo Williams fined for 'Find The Cure' eye black - Sports Illustrated
William Gay on Purple Shoes, Domestic Violence and NFL Fines - Sports Illustrated
Standing up for their cause