Stephen B.wrote a review of Castelli Pro Issue Short-Sleeve Base Layer - Men's on May 1, 2019
Familiarity: I've used it several times
I ordered knowing that Castelli makes quality items and as expected these are no different, started with 2 and have 2 more on the way. I'm 5' 10", 165lbs, 37 chest and Large is perfect. I wear one size up (Large) in Castelli jerseys as well. Definitely recommend ordering a size up.