Costco is requiring customers to wear face masks or coverings in its stores beginning May 4.
The company is the largest US retailer to enact the rule, which is aimed at helping prevent the spread of Covid-19. Costco said the face coverings must be worn "at all times" in the store and will not serve as a "substitute for social distancing."
Certain exemptions are applied, including for customers under 2-years-old and people who can't wear one because of a medical condition. Costco announced the changes Wednesday on its website.
Costco (COST) has enacted a number of changes to its stores as shoppers flock to big box stores for necessities during the pandemic. Other changes include earlier closing times, limiting the number of guests a member can bring and giving first responders and healthcare workers priority admittance into warehouses.