^ Huh... seems to work for me. What color/style/size combo are you trying? Men's Large Navy works for me, I can add multiples to my cart.
Admittedly, I've not actually checked out, because I informed my wife of these shirts just in case she wanted to get them for me for Christmas. She said "sorry, I'm all done" but then when I asked if I could buy them myself she said "No, you can't." so... I'm probably getting them
