Summer’s onset means one thing: sweat. Which means, in addition to slathering on sunscreen, we are getting ready to drink a lot of water. And nothing helps us reach our hydration goals faster than the viral Stanley Tumbler. Good news—the “Stanley cups,” or as Jennifer Garner calls her 40-oz the “big, bad boy” are on sale right now—up to 40% off in various colors and sizes—just in time for the hot days ahead. While Amazon Prime Day runs from July 8 to July 11, we found early Stanley deals on the brand’s website, ahead of the discounts likely to come on Amazon. Select colors in both the 30- and 40-oz sizes of the tumblers are on sale now, including a soft pink, calming mint green, and vivid violet. These water bottles are beloved for their ability to hold a large amount of water in a stainless steel insulation that will keep it ice cold for hours. The soft-grip ergonomic handle is easy to hold, and the narrow bottom fits perfectly into most car cup holders. But the FlowState lid and splash resistant straw is what really secured their viral status. Not only does it stay securely in place, but it offers three drinking modes: straw, sip, or covered. Plus, unlike other similar insulated water bottles, Stanleys are dishwasher safe and have a lifetime warranty. Garner originally received her Stanley as a gift, but she is a fully dedicated fan these days. “My [Stanley] is white, it’s the big bad boy,” she previously told Prevention. “Whatever gets us drinking more water. It’s so important… They are definitely having a moment and I’m right there.” If you don’t believe her, let the ratings speak for themselves. “Love this cup. I already noticed I drink more. The built-in straw makes it easier and spill-proof!” one person raved. “It performs very well. Ice retention is superb,” another added. “I use it every day and it’s pretty durable!” someone else wrote. The 30-oz IceFlow Stainless Steel Tumbler With Straw is discounted as well, which is great for sipping while walking or hiking. What’s not to love about hydrating in style? The Stanley army welcomes you, but hurry and grab yours for a fraction of the price before the sale ends!