Armpit sweat is a fairly common problem and I wouldn't say I overly perspire under the arms but sweaty pits isn't nice at all, particularly when you are wearing a fitted shirt at work or at a dinner party!
I can testify to countless ruined shirts because antiperspirants do stain fabric when the antiperspirant cakes up and rubs off on the armpit region. Granted, I can wear a t-shirt underneath a shirt but that only means ruining the t-shirt which doesn't actually solve the problem of underarm sweat not to say anything about preventing stained armpits!
 An undershirt solution that will achieve two aims at once (sweat control and stain prevention) would be the ideal scenario and NanoDri is one such solution! I came across NanoDri on Kickstarter last year when the project was successfully funded. NanoDri immediately pique my curiosity because of the Japanese fabric and nano-technology being used to block sweat and keep stains hidden, which sounded just like the t-shirt solution I was searching for.
As you can see from the GIF above, the NanoDri undershirt repels as well as absorb liquid so the sweat coming into contact with the mesh fabric is immediately wicked inside, pulling it away from the skin where it is absorbed inside the NanoDri internal fibers.
After having worn NanoDri for a few days, I can say NanoDri does a good job at reducing sweatiness and keeping your body and under armpits relatively dry while being comfortable to wear. The fabric is stretchy and can be quickly dried and machine washed without special detergents. In fact, by the time the NanoDri undershirt comes out of the machine machine's spin dry cycle, it's almost dry!