I am 181 cm tall, weighing 80 kg, have a atletischen physique and need size "L".
Besides that the arm's length to a breath too long (maybe 1 cm), this product is top. After some time while wearing the compression led partially by and from then this dress feels like a second skin. If you ride a bike in winter reaches this undershirt, with three layers (jacket, shirt, undershirt), to -3 ° C in 60-70 minutes rides. From then you should go to the "Cold" variant.
Anything else. If one is not on synthetic fibers should stay away from this product. For me, this is however not a problem at all.