In reply to Wayne S:
My experience of Gortex Jackets has not been good with one exception and that was a The North Face jacket and separate over over trousers which I used successfully for three years when I worked as an instructor with Go Ape - out all days at times in atrocious weather. At times I got really sweaty, but I never had wet underclothing. Then suddenly and without warning it started to leak. Surprise surprise, the so called "life time guarantee" was not honoured because I apparently "hadn't been treating and washing it frequently enough"!! I had been washing it regularly in their recommended wash treatment - same as Paramo, see below.
Since then, I've switched to a Paramo Analogy jacket. This is over 4 years old now, gets a lot of use and I regularly wash it in their special Nikwax Tech-Wash and TX Direct. These products are not cheap, nor was the jacket but so far it's shown no signs of leakage (apart from into the pockets - don't keep your phone in one!). It wears very hot and if I'm walking hard or uphill building up a sweat I wear just a light wicking base wear under it which keeps me warm so long as I keep moving even in winter.
Of the two I feel that Paramo is the better, and it's lasted a year longer now than the best of my previous Gortex jackets, the other ones were crap, including a very expensive Berghaus one which I bought for the Himalayas and leaked the whole time in wet snow. It was only OK in temperatures well below freezing when snow just bounced off it.
On the other hand I have found Gortex lined walking boots to be very good unless the boots had become punctured by sharp rocks.
So long as it's not too windy I have found that the most breathable and rain proof piece of equipment for walking is an umbrella!!