Weird question-

Aerie is having their underwear sale & I tried to do it online. It took forever, but it all worked...until I went to pay. It said some items in my cart couldn't be shipped to my shipping address. How come 7 out of the 10 pairs of underwear couldn't be shipped to Massachusetts?? I want to do it still, but how do I know which pairs can or can't ship until I'm at the very end? It makes no sense to me.