Just received a Fox Creek Classic II Jacket http://www.foxcreekleather.com/6.html
and the quality is stunning! The leather is soft but so thick that it feels like I'm wearing plate armor. All of the worksmanship is first rate. Between the zip vents and the removable lining, I think it will be comfortable from the low 80s to low 30s. Arrived three days after ordering. And it's made by American craftsmen. An investment that will last for decades.