Polartec Alpha comes to the Castelli Alpha jacket. I've had my doubts about the Alpha jacket in its previous incarnations, but this one absolutely works. I take a Small, which has clearly been sized up from earlier Alphas in the neck thank goodness. The internal vest also no longer cuts into the base of my throat. With the Goretex shell and seam sealing, this jacket is secure from the elements and finally is warm and dry inside as well thanks to the Alpha insulation. It still isn't the last word in warmth, but the next rung down. There's room to layer up so not a deal breaker. This is one jacket where you can leave the rain shell at home. Expensive but you're getting the whole package, water and windproof plus the best insulation available.
This is a very warm but breathable item. It is very versatile - I have worn it from 35 F to 60 F.
