Me: slim but fit, 165 lbs, 5'10". Not too muscular. The medium shirt worked very well. The shirt is slightly looser in the stomach and waist than on the chest but helps to tuck the shirt in. The sleeves are just right, not long and not short. The shirt itself sits low on my torso. Not quite low but skin was showing between the mask and torso. It fits me for more Airflow. The shirt is soft and stretchy. Comfortable and breathable like all training shirts. However, I wouldn't call this shirt fully compressible or suitable for really cold weather. I see it as a basic long sleeve sweatshirt. Perfect for training or as a costume, which is why I bought it. The black shirt didn't quite match the separately purchased mask I received but they are from different companies. Not that hot what's up. Overall t a good buy for me.
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