Until Between 15C and 8C, only a base layer under my jersey is enough. I don't need a wind stopper before it gets below 8C.. The thing is I get no cool down on the back so I overheat a bit there, If a two type materials base layer (fleece on front and mesh on back) would exist, I would be fine but I can't find any. May be my only option is like [MENTION=197614]fietsbob[/MENTION] said, build my own.
[MENTION=112025]wolfchild[/MENTION], I could carry a windbreaker for those occasions and even then, jogging beside the bike would prevent me from cooling down too much and if I'm fortunate enough to have strong tail wind (like last Friday), no problem, I'll just go faster and get to work/home sooner