I'm not exactly sure what MFR their fabric's density is compared to or what size chart they're comparing it to, but I have 4 shirts / 2 packs bought, and on the outside they are smaller than a typical long sleeve t-shirt or sweatshirt of the same size and the material is thin enough to be easily seen (i.e. you can see light showing through, not that it can see through properly to see skin underneath). These things are really light, so only suitable for warmer climates. Because of this, it will most likely shrink in the dryer. I think at this price you'd expect the same (too good to be true) so to be honest I'm a bit to blame for the MFR.
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