Yes! Of course the shirt hasn't been worn or washed yet but the shirt material itself is a nice, pure cotton.

The red circle is more brown-red colour than the sleeves (a red-red colour!) but I don't think this matters as the design is simple in colour terms (not many colours so no clash). The other shirt has black sleeves so there is no contrast in reds. The true-to-the-eye colour of the red circle as printed is roughly half way between the two circles you can see in the photo: not as dark as the back one, but not as bright as the front one.

Somebody should buy you one for Christmas!