In-N-Out is barring staff from wearing masks unless they have a medical note. The burger icon wants customers to see employees’ smiles.

• In-N-Out Burger is an iconic fast-food chain based in Southern California.
• The chain said workers must have a medical note to wear a mask in five states where it operates. 
• The chain said the new mask rule emphasizes the importance of showing customers associate smiles. 

In-N-Out, owned by billionaire Lynsi Snyder, is barring workers from wearing masks without a medical note in five states where it operates restaurants, according to an internal memo leaked on Twitter. 

The new mask rule, confirmed by Insider in calls with the chain’s customer service department, goes into effect in mid August — about four months after Biden officially ended the Covid national emergency.