I bought these a few years back from the same seller and the new ones are different.  I like them more. a more silky feel to them.  same great fit, and with a calvin klein graphic on the lower left of the shirt.  No tags to scratch your back.  Nice low cut so the shirt doesn't show when you're wearing a button down shirt (I find it tacky to have an undershirt showing with a button down shirt).  I primarily use an undershirt to capture sweat so it doesn't dirty my work shirts and I get more uses out of work shirts between washes.  In my opinion white shirts have a shorter lifespan due to looking off white while black seems to only fade a bit with time.

The new fabric is more polyester blend over their older more cotton blend.  Time will tell on how these will age.  They went up a couple bucks in price per shirt as well.

I almost got fruit of the loom tshirts this time around.  so glad I cancelled that order. These fit great and I think they'll last longer so it's worth a couple bucks more per shirt.  I'm the kind of guy that finds a fit and style I like.. then I load up.  I get a ton of these as well as carhart black socks.. they are the best socks in my opinion to buy in bulk hahah  tip from me to you.. these two items go really good together for a muted undershirt wardrope.. now If I could just find black underwear that fits well..