I find that many t-shirts absorb sweat, and then the wearer sits in sweat for hours.  As a sweat-er myself, I've tried many brands to find the one that doesn't leave me uncomfortable.  This one is the best I have found, and I have since bought several of this brand.  People who sweat a lot will know what I am talking about when you are worried if others can see your sweat stains.  Not only does this shirt help prevent that, but it feels cool and comfortable to wear.  I wear these under dress shirts, and the only drawback is that it doesn't necessarily fit as snugly around the neck as I would prefer.  To me it's not attractive enough to wear as a shirt on its own, but as a undershirt it is perfect.