FYI, this is included in Prime Wardrobe so you can give it a trial run if you’re a member!
Promising review: “Can I tell you how much I HATE wearing an undershirt on a hot day?! It’s so frustrating to look to look for shirts in the store and have them all be translucent, too tight, too baggy, or have words on them. I saw these and figured I could send them back if I hated them. Well, I LOVE THEM. They are soft, they aren’t see-through, and they fit amazingly well. I get complimented on them every time I wear them. Can’t beat the price either. I can even wear the white ones without an undershirt. I have several colors and will buy more.” —KH
Get it from Amazon for $9.99+ (available in sizes XS—XXL and in 42 colors).
Source: https://www.buzzfeed.com/bykitstone/things-for-anyone-who-doesnt-want-to-sweat-this-summer