Bog standard fleece works really well.I was thinking the same thing yesterday as I seemed to wetter on the inside of jacket than it was outside. You don't mind so much about the cost as long as it works , the trouble is once you have bought it and used it you cannot take it back . Any suggestions as to what base layers to wear to minimise this.
Better still the stuff that I think is called 'grid' fleece.
Someone will be along to rave about wool shortly - and I agree that merino works quite well. But it just isn't quite as good as fleece at retaining warmth when wet.
So I use a thin merino base layer with a grid fleece mid layer. The merino wicks well and the fleece deals with leaks etc from the hard shell.



