I rock a schmedium all day and I ordered the 38-40 chest size. This thing fits exactly how I ride, lews as fuck!!
Solid construction, Hefty enough for cool weather but ventilated well enough for warmer weather rides. The fit is athletic so if you have a dad-bod or stop for post ride beers more often than you actually ride, size up one...or two.
A short sleeve version would be a GREAT summer addition....just saying...Doug.