The menu also includes burgers, chicken sandwiches, cheesesteaks and sides such as fries, onion rings and tater tots, along with a variety of milkshake options. Seasonal offerings highlighted by the company include flavors such as Red, White and Blue, Banana Cream Pie and Chocolate Brownie.
Following the one-day event, the chain will continue its shake-focused promotions for loyalty members. Beginning June 26 and running every Friday through July 31, Wayback Rewards members will be eligible for half-price shakes through the brand’s mobile rewards program.
Company officials said the annual promotion has become a signature summer tradition for the franchise, which operates more than 170 locations nationwide, and is intended to boost guest engagement while showcasing both classic and seasonal shake flavors.
The free shake day offer is valid in-restaurant only and limited to one complimentary vanilla shake per customer. The promotion cannot be combined with other discounts or third-party delivery services and is available while supplies last.