Great for 50-60 degrees (haven’t worn in temps below that). Have to unzip on climbs because a little to warm. Overall keeps you warm but well ventilated in the back. Super comfortable, I forget I’m wearing it

This is basically a polartec fleece. It is not windproof, at all, and a little bit longer than most cycling jackets which means it hangs below most shells that would make it windproof. It’s not really heavy, but not light or packable. So you can’t really use it in the cold whether if you’re moving at any speed without a shell, and don’t want to wear it when it gets warm enough that wind doesn’t mater, because its to much. So, I really don’t know when this is good. Sizing probably is true to size but there is very little stretch, and it pulled against the back of my shoulders, so i had to size up. I would have given it one star, but gave it two because maybe I’m missing something.

I couldn't be more pleased with this jacket. Thanks to the Polartech Alpha lining, it's incredibly warm across a range of temperatures while avoiding the sweaty, clammy feeling that is common with warm layers during high intensity outputs. The fit is on the race end of the spectrum, which results in a pleasingly minimal silhouette. Highly recommend!