This is differently sized from the normal women's t-shirt - I'm fine in a medium in the latter, but had to get small in the Premium one (I'm UK size 10). I can't remember what makes this premium; it's a nice material but pretty standard for a t-shirt. The shape is weird, though, the cuts up the sides are a bit strange. It's very long, too - I like long as I wear low trousers, but this is longer than I'm comfortable with. Reckon I'll stick with the regular shirts in future, though this type is ok.
I love the quality, feel, and length of this shirt.