ALPHA ROS JACKET
ALPHA ROS JACKET
ALPHA ROS JACKET
ALPHA ROS JACKET
ALPHA ROS JACKET
ALPHA ROS JACKET
ALPHA ROS JACKET
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Castelli Alpha RoS Jacket

£260.00

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The goal when Castelli started work on the ROS Alpha Jacket was to create a winter jacket that is good as it can be for cold days. A jacket offering supreme comfort and breathability, a jacket that can adapt to changing temperatures and conditions. Additionally they wanted a jacket that if you did get caught in a heavy shower or the day turned for the worst, you would make it back home warm and mainly dry. A jacket designed for winter riders with you not having to take a cape out with you. As close to a one box solution as modern fabrics and technologies allow.

Please NOTE The Castelli ROS Jacket is not intended to replace a full shell jacket for prolonged heavy rain. Its a bit like the way a Gabba works (on warmer days) so for 90% of the time its all you will ever need this winter. And for nearly every cyclist that is enough.

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Technical details for the Castelli Alpha RoS Jacket 4517502


ROS - Rain or Shine engineering provides insulation and breathability for cold dry conditions with great protection during wet rides.


Articulated Collar for better fit

Gore Windstopper 150 fabric is windproof highly breathable and offers great protection from rain and spray

Seam sealing on the shoulders with a reduced seam main body and double stitching work to keep you dry in all but the worst conditions

Dual layer Alpha construction separates insulation and protection to create better ventilation, moisture evaporation and breathability

Part covered waterproof YKK Vislon zipper lays flat and slides easily

Raw edge waist follows the body contours, lays flat and is low bulk

Raw edge wrists create a perfect interface with Castelli gloves

The stretch fabrics combined with the latest advanced patterning creates a close fit on a wide range of body types

Back ventilation for greater comfort

Castelli silicone text gripper at waist keeps the jacket from riding up

Front zippered key pocket - with waterproof zip

3 large open rear pockets with laser cut reflective drainage patterning

Sizes Men's S-3XL

Weight 515 g (Size L )

Castelli Comfort Range -5 to 10 c Read our Guide on Temperature Ranges

100% Polyamide

The Castelli Alpha Jacket is the perfect UK winter jacket for most riders, with great weather protection and adaptable insulation & ventilation.Its not fully waterproof but do you need it to be? Read about the Waterproof and Breathable myth here.

Castelli Sizing Guide - Men's & Unisex

Castelli Sizing is based on your physical measurements and the garments intended use. Please do not compare sizing with other manufactures. Race item's are designed to use fabric stretch to achieve a very snug fit as such physical garment sizes vary within the range, depending on fabrics used. This is intentional and ensures that each garment works optimally in its given role. For more on fit please consult our FITTING GUIDE

You do not need to size up for jackets or vests please select your normal jersey size.

PLEASE NOTE size shown is the maximum size so for someone with a 99cm chest you would be a size L if you have a 101cm chest you are XL


Castelli Cafe mens size guide diagram


A - Chest B - Waist C - Hips D - Inseam
XS 88cm 76cm 90cm 81cm
S 92cm 80cm 94cm 82cm
M 96cm 84cm 98cm 83cm
L 100cm 88cm 102cm 84cm
XL 105cm 93cm 107cm 85cm
2XL 110cm 98cm 112cm 86cm
3XL 115cm 104cm 116cm 87cm

PLEASE NOTE size shown is the maximum size so for someone with a 99cm chest you would be a size L if you have a 101cm chest you are XL


A. Measure around the chest at the fullest part.

B. Measure around the waist over the belly button

C. Measure over the hip bones

D. Measure from the crotch to the base of the ankle bone

Castelli Cafe - Fitting Guide

Castelli is sized against the rider's physical dimensions the size data in the size guide is the rider size, not the garment size. Castelli garment size is optimised for intended function, So for example an Aero Jersey or Speed Suit are designed to be extremely close fitting, using the material stretch to fit the rider's torso. A race jersey laid on top of a non race jersey of the same size may appear 5cm narrower and not as long - this is intentional as the garment fabrics are designed to stretch to accommodate the riders body shape creating a very close aerodynamic race fit. Never measure old kit to get your Castelli size always measure yourself.

Shoe covers are designed to fit snuggly over road racing shoes only (unless otherwise stated). If your shoes are to the upper end of the size designation and have bulky buckles you should consider the next size up.


1. Snug Fitting; On the bike your jersey or jacket fits snuggly. When riding you don't hear or feel any fabric flapping the close fit helps the capillary action of the fabric to draw moisture from the skin helping you feel drier and more comfortable.


2. Rider Positioning; Fit Off the bike your Castelli jersey or jacket might feel tight across the chest and a little short at the front. This is because the jersey is designed to fit the rider in the riding position. On the bike the fit is prefect with no bunching at the waist and no sagging over the chest. Please keep this in mind when trying on new garments.


3. Fabric Engineering; We use fabrics specifically engineered to wick moisture from the skin or between fabrics, We have created a apparel range that starts with wicking base layers passes through jerseys and onto jackets and shell fabrics. Every element is designed to optimize its specific application - wicking, cooling, thermo regulation, breathability and protection. In order for this to work the fit has to be snug (but never tight)


4. Aerodynamics; The other important aspect of close fitting garments is the aerodynamic advantage they provide. We work closely with professional riders from the Cannondale Team and in wind tunnels to optimise the fit, (again in the important riding position) sleeves are articulated forward to eliminate wrinkles and provide maximum body contact. As an example of our obsession we created the Gabba range of products based around the fit of a race jersey Gabba fits snuggly but provides ultimate weather protection its a key race piece for poor weather conditions allowing athletes to gain an aero advantage over rivals in rain capes.


5. Bib-short Fit; Bib-shorts fit is just as important as a jersey in providing performance - enhancing features such as aerodynamics and muscle support, as well as protecting your bottom from hours spent in the saddle. Bib-shorts should fit tightly enough to support critical leg muscles through compression without inhibiting movement and constricting blood flow. Using a combination of fabrics allows us to fine tune each material's characteristics to optimize fit and performance.

For more details on fitting please visit our full FITTING GUIDE

The Correct care of your Castelli items will vastly prolong the garments life and help to maintain your unfair advantage.


These are our general care instructions - For full care instructions and for specialist cleaning instructions visit our COMPREHENSIVE CARE GUIDE


If garments are heavily soiled with mud or road salt then rinse until the water is clear. Do this in the shower or the sink before washing (cold or warm water only).


If you've used fabric softener in your machine recently, make sure all traces are gone from the machine drum and detergent tray (put the machine on a rinse cycle before washing your kit).


Close all zips and Velcro fasteners and turn the garments inside out.


Try to wash all your cycling kit together and only wash whites with whites colours with colours.


Don't wash cycling kit with bulky or dyed items like jeans or towels.


Machine wash on a warm cycle (40°C / 105°F MAX) using a small amount of non-bio liquid detergent -- we recommend Fairy Non-Bio liquid. Choose a cycle with a double rinse and minimise spinning to reduce creasing.


Do not use powder detergents or any products that contain fabric softeners, conditioners, stain removers or bleach as they may affect garment performance -- destroying wicking treatments, elastics, membranes, water-repellent treatments and sun protection treatments as well as washing out colours. Use of any of the above will void your warranty, too.


Remove promptly from the machine following washing and hang dry or dry flat. Do dry on a radiators or tumble dry


For full Care instructions and for specialist cleaning instructions visit our COMPREHENSIVE CARE GUIDE

Castelli Cafe Delivery



On orders over £50 and on orders under £50 at our discretion your Castelli Cafe package will be delivered by Parcelforce on an Express 24 h service to your stated delivery address. It is your responsibility to have someone available to sign for goods. Goods will not be left unsigned for, if no one is available to sign for your goods, a card will be left (where possible) and your Castelli Cafe package will be left at your local post office. On some small items under £50 we may still post for free using a cheaper signed for service. We do reserve the right to charge postage and packaging fees on orders under £50 in value, this will be a flat charge of £5 and will show on the first page of the checkout pages.

DELIVERY Terms and Conditions


CASTELLI CAFE Returns



At Castelli Cafe we are happy to offer a full refund on any items returned to us within 30 days of receipt for any reason if the item is unused.

We also offer a full refund (at your request) for goods that prove to have a fault within 30 days of receipt even if this item has been used. Please note you can still request a replacement or repair this is at your discretion.

In addition we offer a full 2 year warranty against manufacturing defects from date of purchase. We will repair, exchange or refund you, for manufacturing or material faults at our discretion in line with fair wear and tear.

RETURNS Terms and Conditions


Please refer to our full T&Cs for more details on purchasing, delivery, returns and your rights as a consumer.

Castelli Cafe TERMS AND CONDITIONS