For Slurpee lovers, Tuesday marks the official start of summer. On July 11, 7-Eleven stores nationwide will be participating in its annual 7-11 event by giving free Slurpees away to its customers in celebration of its 90th birthday.

From 11 a.m. through 7 p.m., participating 7-Eleven stores nationwide will be giving away one free, small Slurpee to each customer. This deal is only valid while supplies last, though over 9 million complimentary drinks are expected to be gifted.

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“Celebrating our birthday with a free Slurpee drink, the product that is probably most closely associated with 7-Eleven, is a natural … and fun … way to mark the day!” Laura Gordon, vice president of marketing and brand innovation, said in a statement. “7-Eleven Day is a celebration, not only of our birthday, but more importantly, of our customers. Ninety years is a big birthday, and our customers are the ones who got us here. By adding Slurpee Week, we have a whole week to say thank you for their business throughout the year.”

Some stores will be adding to the fun by carrying reflective Slurpee Chrome Dome Lids and Chrome Dome Cups. 7-Eleven will also be launching a new Slurpee cup design with colorful bubbles and swirls. The design will roll out on other Slurpee cup sizes later this year.

A new flavor to put into the newly-designed cups will also be available just in time for the celebration – the Cotton Candy Slurpee.

“It’s all the goodness of the light, fluffy treat you loved as a kid,” 7-Eleven has teased. If the flavor sounds appetizing, you better get it quick! Only participating stories will be carrying the unique drink for a limited time. Find a store carrying it nearest to you here.

If you’re not into Cotton Candy, 7-Eleven will still have their traditional, popular flavors available for free Slurpee day including Trolli Pineapple Lime, Wild Cherry, Sour Grape, Coca-Cola, Pina Colada, sugar-free Pineapple Mango, Blue Raspberry and more. Other limited time and fun flavors include Watermelon Lime Slurpee Lite, Lemonade Slurpee and Pepsi Fire.

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The fun doesn’t end on July 11, though. As 7-Eleven stores have done in past years, the days following 7-11 will also be filled with freebies and surprises. 7Rewards members who buy seven Slurpee drinks from July 12-18 using the 7-Eleven mobile app will be rewarded with 11 Slurpee drinks free.

To help Slurpee-lovers keep track of their purchases, the app has added a “Slurpee cup icon” to show fans how close they are to earning their 11 free drinks. Once the seven required drinks are purchased to redeem the freebie offer, coupons for 11 drinks will automatically appear in the “scan and save” section of the app 24 hours after the qualifying purchases are made. The free drinks can be redeemed one at a time or all at once through Aug. 31.

Slurpee purchases also count towards the buy 6-get 7th free rewards offer as part of their 7Rewards Loyalty Program, which is ongoing.