I love the idea of a wool garment and this is 21st century wool: fine, warm in winter, cool in summer, odourless , skin-friendly, easy to wash (I use the "hand wash" cycle in cold water in the machine, then just hang on a hanger to dry, don't even lay it on a flat surface). I do everything (everything!) that is advertised. You can tell it's snug, but: It's a baselayer t-shirt. If you want to use us as underwear, this is what you need. If you wear it primarily as a t-shirt it will still fit your normal size, but if you are used to or prefer looser shirts, just order one size up. I am satisfied with the standard size.