I have been buying Zenkai t-shirts for over a year and a half now. I only have 4! That should speak to the quality of not only the fit, but the durability of the tshirts. They are unbelievable quality, and you can wear them multiple times before needing to wash them.
The fit is perfect, I have always looked for a tshirt that is well fitted to the shoulders but looser around the waist, as most athletic fit tees don't cater to that.
Awesome tees and I will be buying these forever!