Nike claims the ninja style headbands "unprofessional" for NBA basketball, yet Rafael Nadal is rocking one in the US Open Men's final... with a Nike logo on it. : r/nba
Headbands. Nike.com
Russell Westbrook w/ nike ninja headband - NBA 2K19 at ModdingWay
Nike Dri-FIT Head Tie. Nike.com
NBA bans ninja-style headbands due to safety concerns - Sports Illustrated