Cool off with milkshakes on the first day of summer this Friday, as Wayback Burger is giving away free shakes at each of their stores. 

The burger chain is giving out a free 12 oz. Black and White milkshake and no purchase is necessary. The offer lasts from 10:30 a.m. until close. 

“Summer is such a fun time of the year. It makes you think of sunshine, childhood memories and of course, ice cream. We are so excited to ring in our favorite season with Free Shake Day,” Wayback Burger CEO John Eucalitto said in a statement. “We at Wayback Burgers love to inspire moments of nostalgia while making new memories over great burgers, fries and milkshakes. We’d love to have our guests come join in the fun."

The burger chain is hoping to give out hundreds of free milkshakes and their restaurants have stocked 50 times their normal supply in preparation for the day, according to a press release from the company.

Wayback Burger is located in Round Rock at 1900 University Blvd.

National Selfie Day also falls on this Friday, and the Wayback Burger encourages customers to take a selfie with their free shake.