I didn't purchase these on Amazon. I got these as a gift and I think I'm in love. I have over 15 plain white (off-white now, I guess) and I wear them daily as my undershirt. I can really tell the difference in quality after I put these on.  The 100% supima cotton is really noticeable vs plain cotton. It's so comfortable, soft to the touch, and more stylish as it give a slimmer non-sagging fit. I'm 5'5" and 155-60 lbs range and I got the medium. The fit is just right with enough room to breathe and it doesn't "show' through your dress shirt.  It is longer than your normal t-shirt as it should because it's designed to be tucked in. The undershirt is thinner so it is somewhat see-through, just a tad bit. I don't believe that to be a con. This is a situation where you pay a higher price for a superior quality brand like Lacoste and you can see/feel the difference. Overall, I'm very satisfied with these shirts. I will probably try to find more to replace my other worn out shirt! I highly recommend that you purchase a pack and try it out. If you find this review helpful, please click 'helpful' button at the end of this product review. Thanks!