These t-shirts are rather lightweight, but they are very comfortable and work well for me as an undershirt, or as an alternative to going topless while working out. Because they are so light, they dry quickly. Speaking of which, they will shrink substantially as others have noted, so I recommend washing them in cold water and keeping an eye on them in the dryer.

One other thing is that the Washed Heather Gray picture above depicts a pocket t-shirt - this in not the case. They are a light gray with no pocket and somewhat different from the black. I believe the black is 100% cotton, while the gray is 75% cotton/25% polyester - this is probably why the black feels a little more comfortable to me.

I only recently purchased both the black and gray and can't speak to their longevity, but and at around three bucks a shirt it's a pretty good deal.