These shirts are certainly a step (or 3) ahead of the generic undershirts available at your local super-center.

Yes, they're a bit more expensive, but totally worth it.  The material is soft and comfortable, and has thus far stayed impossibly bright.  I'm sure it will fade over time but my old white shirts look, at best, dark gray compared to this shirt.

The shirt is thick enough that you can wear it by itself if you'd like. (and I do, after work)

The only downside is that the shift has a bit too long of sleeves.  Depending on the polo I am wearing over it, I sometimes have to push sleeve material back under the polo sleeve.

I bought the 3 pack first and then came back to buy the 'value' 6 pack.