Our Tri-Blend shirt is as thin as it is sturdy. Easily the lightest FEELING t-shirt we've ever worn, without it LOOKING too thin. It stretches where it's supposed to and pops right back into shape, so it stays looking fresh all day. In 100-degree weather, you probably won't even notice the shirt when it's on. If the 50/50 is like butter, the tri-blend is like a feather. Apologies for the ALL CAPS. I wasn't yelling, I promise.