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Castelli Alpha Women’s Jacket

Castelli Clothing

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Described by Castelli as “our most innovative jacket ever”, the Alpha will keep you warm in all but the most extreme conditions, even when worn over just a base layer. Our favourite thing about the design of the Alpha is its dual layer construction, which enables you to open the windproof layer independently from the insulating layer. In practise, this means that it is much easier to effectively get cool air where you need it, preventing overheating and unwanted moisture buildup (which can then later make you too cold when you do cool off or stop).

Our second favourite thing about the Alpha (there are quite a few things about this jacket which we really like!) is its use of advanced patterning on the fabric, which means that the jacket fits close to the body but will also work with a range of body shapes. The Windstopper fabric is very lightweight and breathable and will block wind effectively, as well as providing some water resistance. The jacket is finished really well, with raw edge waist and cuffs for a smooth, flexible fit and good glove interface. The asymmetric zip is easy to use and doesn’t bunch. The articulated collar effectively keeps out draughts and sits comfortably against the neck and the jacket is finished with reflective details for that added peace of mind when light levels drop.

Castelli Alpha Women’s Jacket



Earn 176 Rider Points when you buy this item
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Product features
  • Deep Cold
  • Reflective
  • Windproof
  • Open Road
  • Mountain Trails
In Detail
  • Weight: 335g
  • Windstopper® 150 fabric
  • Separate insulating layer for better ventilation and moisture evaporation
  • Silicon gripper at waist
  • Three rear pockets including one zipped pocket
  • Articulated collar
  • Back ventilation
  • YKK zipper
  • Great design for on the bike ventilation - separate windproof and insulated layers enable you to open the windproof layer separately from the insulated layer for better temperature and moisture management
  • Windstopper fabric has four way stretch and is fully windproof and water resistant
  • Asymmetric zip is easy to use and lays flat
  • Raw edge waist lays flat and moves with you
  • Raw edge cuffs provide the perfect interface with gloves
  • Advanced patterning on the fabric provides a close-to-body fit which works with a range of body shapes
  • Close zips and fasteners and turn jacket inside out before washing
  • Hand or machine wash on a lukewarm setting (maximum 40°C) with a small amount of detergent
  • Do not use powder detergents or any products that contain fabric softeners, conditioners, stain removers or bleach as they will affect garment performance
  • Hang dry or dry flat
  • Jacket can be tumble dried on low heat for about 20 minutes to rejuvenate the water repellency
  • Use a spray on water repellency restorative if the jacket begins to lose its water repellency
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Size help and product measurements
Castelli Alpha Women’s Jacket



Size Chart
This is the brand’s general size chart, use this to get an idea of which size is right for you.
chest (cm) 92 96 100 105 110
waist (cm) 80 84 88 93 98
inseam (cm) 81 82 83 84 85
chest (cm) 79 84 89 94 99 104
waist (cm) 63 68 73 78 83 88
hips (cm) 87 92 97 102 107 112
inseam (cm) 75 76 77 78 79 80
palm size (cm) 24 24.8 25.4 26.6 26.4
For an accurate glove size, please measure across your flat open palm just below the fingers, then compare your measurement to the chart above. If it's a close call, go one size up or down depending on the result.
shoe size (Euro) 36-39 40-43 44-47
Overshoes S M L XL XXL
shoe size (Euro) 36-39 40-42 43-44 45-46 46-48

Where is my order sent from?

All orders are packed & shipped from our HQ in the UK on the same day you order, if in stock and ordered before 3pm GMT Monday to Friday.


We offer both mail and express ship options courtesy of Royal Mail, UPS and DPD depending on the country.  Below you will find a rundown of default delivery costs, but to see your personalised shipping cost, please visit the delivery section of checkout when you have added some items to your bag. Please note that orders of bulky items will attract a surcharge.

N. AMERICA Up to 10 working days, from $8 2 day, from $15
EUROPE Up to 5 working days, from €5 Next day, from €12
SCANDINAVIA Up to 5 working days, from €5 Next day, from €12
AUSTRALIA / NZ Up to 10 working days, from $10 3 day, from $25
JAPAN Up to 10 working days, from ¥700 3 day, from ¥1800
REST OF WORLD Up to 14 working days, from $10 3 day, from £25

60 days return period

You may return items from your order for any reason up to 60 days after delivery. 

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