Check out this RibbedTee review where Uman from the wildly popular Men's Underwear Blog gives RibbedTee undershirts a 9.5 out of 10 rating!
"Now you might say, "undershirts, big deal, they're all the same, right?" Wrong, they're not all created equal. RibbedTee undershirts are the first undershirts that I've seen that implement ribbed fabric into undershirt styles other than an A-shirt (also known as a muscle shirt, or tank). I've always liked the feel of the ribbed fabric on A-shirts but found that they really had no purpose since they had no sleeves and that's where you want the most protection from sweat for your clothes."
"But these undershirts have truly changed the way I think about undershirts. The fit of these things is awesome. The ribbed fabric allows them to conform perfectly to your body. It's fitted enough that you aren't going to get any uncomfortable and unsightly bunching, but it's loose enough that you don't feel squeezed. They are made just long enough that you can tuck them in without worry of them pulling out, but if you don't want to tuck you don't have a ton of fabric hanging out either. The v-neck has just the right amount of dip that it doesn't stick up above your shirt in an unsightly way (especially useful if you want to leave the top button undone, but don't want your undershirt to show)."
Read the full review here.