I use Dri-Fit as my midlayer, works very well! For spring riding I put on my base layer with a DriFit hoodie over that and then my jacket. I think that's what you wanted, jumper=hoodie right? I don't get sweaty since it wicks away moisture, polyester fabric is quite thin so it's very light and not bulky but still warm. And it dries remarkably quick, I've had snow come up my back and soak the hoodie but with a few minutes in the heat(like the ride on the lift back up) and its good to go.
On colder days I add in a thick polyester flannel shirt under the hoodie for the extra warmth.