I'm about 5'10" and 155 pounds i don't...
I'm about 5'10" and 155 pounds i don't want it to be too baggy so would a medium fit alright?
Looking at the previous reviews on this shell, I am all for your choice of medium. I know you aren't looking for too baggy, so this would be a wise decision. It seems as if this piece runs with some bagginess regardless, so your arms should have no exposure either. You can always check out the sizing chart underneath the drop down options menu just to be sure.
Enjoy your 40% off! Savage deal!