I bought two of the version that has just been replaced.
Small was too small, medium is a little casual in fit for ideal and the front panel hangs a little clear of my chest when riding in prone position.
I have found it very tolerant and useful.
The front panels keep the wind chill off on descents, the thinner rear panels provide for heat escape.
The front zip position can be fettled to allow just the desired wind flow into the jacket as well for cooling if required.
And obviously the arms come off.
I have worn it in some pretty hot weather, and I was out in some heavy downpours last summer but didn’t really seem to notice how bad they were – I came across some older guys touring and with Gore waterproofs on – they said they had sheltered during the downpours but I hadn’t bothered and wondered what they were on about!