They are not kidding about "Slim Fit" at all.  I have rather slim frame, about 6'1" and 160 lb, but it still fit me tightly.  And the tight fit only became tighter after the first wash.  It is still pretty comfortable and I wouldn't say it is too tight...after all, it is supposed to be a tight fit.

I would comment though that this shirt is long.  It hangs down a good 6" below my waist.  Not too much of an issue since I wear it as an underwear, but I have no idea why it is designed to be so long.  And I'm sure it hangs down even lower for shorter folks, so something to consider when buying this item.

It is an inexpensive set of undershirt and I think it is a good deal.  You may be able to find better deals at discounted clothing stores, but since this item was eligible for free shipping I took advantage of the convenience.