I have bought several of these shirts over the past 4 years, and they have changed slightly, the materiel is a bit thinner, but they are much more comfortable, and they make it a true "undershirt". Here in sunny Sydney, they really aren't for warmth, but for absorbing sweat so you don't ruin your nice business shirts.  In that they excel.  I've washed them maybe hundreds of times, and they more or less keep there shape, and are easy to bleach if you get them a bit grimy.  The fit is spot on too.

Good product and well priced.