I ordered two of these, one in dark blue and one in dark grey. Both shirts are interlock, so the same US polo shirt. However, navy blue is 100% cotton and significantly less grey. Also, the gray shirt is a 60/40 cotton blend and really does run a bit larger than most of my other shirts. Something like that makes no sense at all for US polo. I can't blame Revain as the labels on the shirts have the same product ID, I think it's just an unfortunate choice of US polo design. I have no idea what the other colors are made of, I can only comment on the two I bought. See photos for more information.
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