Hanes Mens 6.1 oz. Tagless ComfortSoft Long-Sleeve T-Shirt (5586)

Is the white shirt see-through?

Is the shirt like tight fitting?

what is the difference between Medium and M US? Thank You!

Why are some of these the "beefy t" and some are not? i got one a last year, and it was "beefy t". i ordered two more this year and they are not.