We’ve reached the point of summer when partaking in a patio spritz or afternoon stroll feels more like a trip to the sauna than a relaxing, fresh-air activity. It’s cancel-your-plans-and-stand-in-front-of-the-fridge hot. And while, honestly, the most comfortable thing to wear during a heatwave is…nothing, it’s not exactly socially acceptable to grab a lunch or walk your dog in the nude (at least in most zip codes).

Your next best option—short of relocating to a nudist colony, which isn’t the move for a fashion girly—is an easy, breezy cotton dress. Something lightweight, effortless, and airy, like my fave Amazon find of the month: this Square Neck Sundress that’s just $35 during Prime Day. I can promise you it’s a lot chicer and more effective for staying cool than your current “survive by the fan” strategy.

The design has a relaxed A-line silhouette that’s just as flattering as it is breathable, and the sleeveless and above-the-knee cut keeps it properly ventilated. Don’t even get me started on how cooling the fabric feels against your skin—once you go 100% cotton, you’ll never go back.

It’s one of those throw-and-go ‘fits that you’ll reach for constantly, and not just on scorching hot summer days. In peak summer, you’ll live in it with sandals, flip-flops, and kitten heels, but it’s versatile enough to bring into spring and fall too—just picture the dress with a cowboy boot or cardigan layered on top!

Shoppers gushed over the “beautiful” style and said “it’s perfect for summer,” and even the white isn’t “see-through at all.” It’s always good to double-check that!

“Flattering and fun! The square neckline and wide straps give it a chic, structured look while staying comfortable. The fabric feels lightweight yet substantial,” another gushed. “It’s perfect for summer outings or nights out, and the quality makes it feel more expensive than it is.”

And while clearly, we’re obsessed, this cotton mini isn’t the only chic style on our radar for Prime Day. The sale is an oasis of markdowns, including fashion deals on Levi’s, Ray-Bans, New Balance, you name it. Snag a new shoe to go with the dress while you’re at it.

Some more favorites: