Pyrenees in the rain - best protection from rain & wind

I'm after some advice on weather gear for tricky climate climbing. In June this year I'll be doing the Raid Pyrenean.
I cycle mostly in France these days and have tackled a number of Alpine ascents already,
climbing them doesn't seem to be that much a problem it's descending where I sometimes get in a pickle.
On occasions on descending from 1600m+ I get the shakes, cold through wind chill and wet through the
sweaty ascent or rain I begin to freeze and shake and that results in the bike becoming really unstable.

So I was wondering if anyone out there had any tips on finding the right gear for incidents like this.
A fold away jacket which offers good wind protection up top and on a descent but is breathable on the way
up so I don't get ridiculously sweaty and will also keep me dry, it always rains on Le Tourmalet
apparently. I have a Gore Path Jacket which claims to be all of these but frankly isn't any of them.

Any advice would be warmly welcome.