Firstly, thanks to previous reviewers who included their height, weight, and the size purchased. I took the advice and bought XL even thought I'm 6'2" and weigh 160 lbs. The fit is very good and nicely snug, even with my chicken legs. I can't imagine even getting into a smaller size.
The only reason for not giving these 5 stars is that I haven't had them long enough to evaluate durability. I hope they last because that would make them a great value.
A well-made product. Fit is good, I like the zipper pocket. But for SF Bay Area, it's too light for mixed conditions. My XL Espresso jersey weighs only five ounces, while most of my jerseys are 7-8 oz. The SF Bay Area has lots of different micro-climates. A ride can go from temps in the 90s on an exposed inland climb to temps in the 60s on a foggy coastal descent. I prefer a slightly heavier jersey the keeps me barely warm enough in cool temps, but keeps me cool enough when fully unzipped in the higher temps. Castelli jerseys are a little too thin. I agree with most comments that you should order a size up. With a 42" chest, I'm a large in most jerseys, but an extra-large in Castelli jerseys. Price is OK when on sale.
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.
I really like the fit of this jersey; its not too long in the body and doesn't sag/droop with full pockets. Also, it fits snug but not too tight around waist. The simple single light color with no patterns or excessive logos/branding is a bonus. The fabric is fine at wicking in the heat/humidity of central Texas. I just wish I understood the fit/style variations of Castelli garments ... if I could find more that fit like this, I would buy them more frequently but every model I try is different.