Why did the NBA ban ninja headbands?

NBA news: Oklahoma City Thunder vs Memphis Grizzlies final result, record for biggest point differential

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New! BANNED Nike Dri Fit NBA Ninja Style Head Tie Sweat Headband Blue CT3652 NWT

NBA bans ninja-style headbands for next season; competition committee reviewing - NBC Sports

Report: “Ninja-style” headbands banned by NBA despite popularity - Golden State Of Mind

NBA bans 'ninja-style headwear'

NBA banned list: Accessories not allowed in league - Sports Illustrated

NBA planning to ban 'ninja-style' headbands next season, league spokesperson says

NBA bans ninja-style headbands for some reason

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