The Power Wool is the piece that sits between your thermal jersey and traditional tight woven wool jersey. The combo of wool and Polartech really sets this into it's own class of comfort and breath-ability while keeping the body warm. On 30 degree days, or cooler, pairing this with a Gore Windstopper long sleeve base and Gore Windstopper Vest has been perfect combination to keep the core warm on the mountain bike. On 40-50 degree days this with a summer sleeveless base & Gore Windstopper Vest was the perfect combination for a long day in the saddle on the road. It's really the most versatile outer layer I've found yet. The only small complaint I have is the back could come down a bit lower to better stay over the lower back. When I have a hip pack on for trails I can sometimes feel it run up. It's not enough to disappointment me, but it's just enough to notice.
Very comfortable, great fabric and very good fit.
I've only managed one ride with the jersey so far so I can't speak to durability. However, comfort and function were great. Love the stretch and properties of wool.