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Castelli Alpha Jacket - Women's Castelli  Alpha Jacket - Women's $349.95

Item # CST009B

Queen of the mountain.


Windstopper 150
Windproof Rating:
<1.0 cfm
3 rear, 1 zippered rear, 1 zippered front
yes, rear pocket
Claimed Weight:
335 g

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 Sarah EdwardsHeight:5'11"Weight:145lbs
Posted on February 20, 2017

Essential for all of us who winter ride

First impression: Woah this jacket is seriously rockin'. Honestly the warmest cycling jacket I have ever owned and super quality design and fit, Castelli really thought of everything. I wear this jacket in a medium and I thought it would be a little bit tight since Castelli runs small but this jacket fits me like a glove. The arms are the perfect length and have a nice tight cut around my wrists to keep wind out. The windstopper fabric is absolutely the toastiest fabric. I've worn this jacket down into 20* with a winter base layer and it was super warm.I wouldn't wear it above 45* or 50* because you will be sweating for sure. I love how high the neck goes up, almost all the way to my chin they I zip it up, this really does a good job of keeping the wind out. At first I was skeptical about the inner zipper that kind of feels like a jersey attached to the inside of the jacket but I actually really like this feature! You can barely tell in the photo in the description but the inner zipper/ jersey like material makes it easy to unzip the jacket and still maintain a nice fit and not have the jacket flapping around. I will say that the inner zipper/ jersey part is pretty short compared to the rest of the jacket (goes barely below the top of my bibs) but once I'm bent over on the bike this is not an issue. Just looks a little funky in the coffee shops but its what you do on the bike that matters;) You can see the inner zipper/jersey (can't think of a better way to describe this feature...any suggestions??) in the super intense and not staged photo below. Keep in mind while it looks sunny and nice in the photo, it was 32*. However, I was unfazed by the cold because of this rad jacket and was able to maintain my silly facade and not be grumpy/freezing, so cheers to that!

Overall seriously love this jacket and I recommend it to all my lady friends out there who like to bear the bitter winter temps to play bikes.

**I wear a medium in Giordana jackets and medium in Castelli jackets--if you want a more loose fit in this jacket I would recommend sizing up, it is definitely really form fitting even in a medium for me*** Carolyn K.Height:5'3"Weight:127lbs
Posted on January 24, 2017

Odd Fit Outweighs Quality Construction

The fit of this jacket is truly odd, in my experience.

Normally a size small fits me almost perfectly in Castelli tops, with a bit of room to spare for an extra layer. If anything, the waists are slightly loose, but the shoulders fit fine, even though mine are rather broad. For reference, I am 5'3", 127 lbs., 34" chest, 27" waist.

However, with the Alpha, the chest and shoulders were so narrow, and the material so inflexible that even the medium felt like a straight jacket in those areas. Conversely the waist was comically big in both the small and medium, puffing out like a balloon.

When a friend of similar height, but with narrow shoulders and a more blessed midsection, tried on the medium-sized jacket, it fit her wonderfully. Based on that, I would say it was styled mainly for that body type.

In terms of construction and materials, the Alpha is of high quality, as most Castelli products are. It is a beautiful jacket. Unfortunately those aspects are far outweighed by the perplexing fit. Sarah W.Height:5'5"Weight:109lbs
Posted on December 25, 2016

True to product description

This riding jacket delivers in the winter! I recently purchased it (winter 2016) to block wind and wick away moisture for road riding, and it has performed very well in as low as 24 F weather with base layer and thermal layer underneath (haven't had a chance to ride in lower temps yet). Also rode in 60 degree weather with only base layer underneath and it was comfortable - not too warm. It is lightweight, has great zipper side pocket for keys and ID and another zipper pocket further back which will easily hold a smartphone. It also has three open, deep pockets in the back. The length in the back keeps the wind out, and the high collar with a thermal neck piece in the back seals everything all around. It washes well and keeps its shape. As far as size, I typically wear an XS but purchased an S to have room for a couple layers underneath. Very pleased with this product. Dawn G.
Posted on December 5, 2015


I've only used this jacket once so far but it will be my winter go-to jacket. I rode in the low 50s, dropping to high 40s by the end of the day. I had just one base layer- Craft active long sleeve. The jacket was perfect- I unzipped as I climbed, then zipped back up for descents- never got too hot or cold. The offset zipper takes a bit of practice when trying to zip back up while riding. The jacket fit like a glove- no drafts or cold spots. I like the raw edge sleeves as it made getting gloves on much easier. I just pulled the glove edge over the sleeve edge. The jacket is very lightweight for its warmth.