Mask sales have risen 24 percent after weeks of decline, data from the Adobe Digital Economy Index shows.
The company found a 24 percent increase in mask sales from July 21 to July 27 compared to the previous week.
It is the first time mask sales have increased in weeks, as sales have been on the decline since May.
Even a week prior to July 21, sales were down 5.6 percent.
NielsenIQ data also tracked the decrease in mask sales going from more than $101 million in mask sales at the beginning of April to more than $37 million in mask sales at the beginning of July. The data for the rest of July is not yet available.
The increase in mask sales comes as the delta variant continues to cause coronavirus cases to rise around the country.
The Centers for Disease Control and Prevention (CDC) has responded to the rise in cases by telling vaccinated and unvaccinated individuals to wear a mask indoors.
In response to the new CDC guidance, states are reimplementing indoor mask mandates for all individuals.
Sales in masks were previously down after most states lifted mask mandates on vaccinated individuals in May when the CDC said it was allowed.
The reimplementation of the mandates could be leading to a rise in sales because it is unclear how long vaccinated individuals will be told to wear a mask indoors.