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Castelli Alpha Ros Windproof Cycling Jacket

From £165.00
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Note: Castelli size their clothing small. For the best fit, go up one size

Product Description

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. It’s a bit like the way a Gabba works (on warmer days) so for 90% of the time it’s all you will ever need this winter. And for nearly every cyclist that is enough.

 

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

 

The Castelli Alpha Jacket is the perfect UK winter jacket for most riders, with great weather protection and adaptable insulation & ventilation. It’s not fully waterproof but do you need it to be?

 

 

Product Features:

  • 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
  • 100% Polyamide

Note: Occasionally, without notice, manufacturers change product design and/or specifications.

Castelli Alpha Ros Windproof Cycling Jacket Reviews

Write your own review
Overall Rating:
2.9
out of 5
2.92
Build Quality
3.50
Performance
2.75
Value For Money
2.50

Customer Reviews (2)

1
Rain or shine - unless the rain is wet

Second ride in this jacket today - 45 min commute. It rained and I was soaked through in less than 5 minuets. The ROS means rain or shine but unless the one I have is faulty it's not waterproof at all. Very disjointed as I bought this for a winter commuting jacket so I didn't need to carry a waterproof - I still need one

Second ride in this jacket today - 45 min commute. It rained and I was soaked through in less than 5 minuets. The ROS means rain or shine but unless the one I have is faulty it's not waterproof at all. Very disjointed as I bought this for a winter commuting jacket so I didn't need to carry a waterproof - I still need one

Close review
1 out of 5
Build Quality: 2/5
Performance: 0.5/5
Value For Money: 0.5/5
5
Does what it says on the tin

Totaly up to Castillo standard they are siezed very small l am an endurance cyclist and have worn their kit for years so was suprised to find the large too small as all my other jackets are large and fit go for one size up

Totaly up to Castillo standard they are siezed very small l am an endurance cyclist and have worn their kit for years so was suprised to find the large too small as all my other jackets are large and fit go for one size up

Close review
4.8 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 4.5/5

Castelli Size Chart

Castelli

Castelli Clothing Sizing Guide

Use the Castelli size chart to find the best fit for you.

Note: Castelli size their clothing small. To ensure an optimal fit it is recommended you go up one size, compared to your normal cycle clothing size. 

Castelli Men's Sizing

  S M L XL 2XL 3XL
Chest 92cm 96cm 100cm 105cm 110cm 115cm
Waist 80cm 84cm 88cm 93cm 98cm 104cm
Hips 94cm 98cm 102cm 107cm 112cm 116cm
Inseam 82cm 83cm 84cm 85cm 86cm 87cm

Castelli Women's Sizing

  XS S M L XL
Chest 79cm 84cm 89cm 94cm 99cm
Waist 63cm 68cm 73cm 78cm 83cm
Hips 87cm 92cm 97cm 102cm 107cm
Inseam 75cm 76cm 77cm 78cm 79cm

Read our clothing size guide for more information on sizing.

Please note, all size information is provided as a guide - if you're unsure or need any further assistance you can call us on 01792 799508 ... we're happy to help!

Windproof Jackets Guide

 

Windproof Jackets Guide

When the mercury drops most people turn to putting to layering up to keep warm. However, when you’re cycling the last thing you want is to feel like the Michelin man, bound up, inflexible and uncomfortable. As you ride you’ll get warm very quickly, wearing all those layers will make you sweaty.

Why not choose a windproof cycling jacket instead? They’re ideal for cold dry winter days with most offering some type of light rain protection as well. Windproof jackets tend to be lighter than a waterproof model and are much more breathable.

You can also check out our waterproof cycling jacket guide if you’re planning to ride in the rain. By the end of our windproof cycling guide, you should have all the info you need to buy the right jacket.


Types of Windproof Jacket

Packable Windproof Jacket
| Spring & Autumn

For cool rather than cold rides, a packable windproof jacket may be all you need to keep the chill off. These jackets are very lightweight and are usually made of a single layer of fabric. They’re only a simple barrier between your skin and the elements.

However, these jackets usually have good breathability to stop you from feeling clammy on the inside. Even if it rains, a packable will dry quickly. Most can be rolled up into a small package and will fit in a spare jersey pocket.

Lightweight windproof jacket

Softshell Windproof Jacket
| Spring, Autumn & Winter

Softshell windproof jackets have been gaining popularity for a few years now. They’re heavier than a packable to block more wind and are smooth against your skin for a comfortable feel.

Softshell jackets can be worn over a base layer or a jersey on colder rides without the need for multiple layers to keep you warm. Many are treated with water resistance for light rain protection making them a practical jacket for a wide range of UK riding conditions. You can also pair a softshell with a lightweight packable waterproof jacket for maximum protection.

Softshell windproof jacket

Fabric

The fabric is key to performance. Generally, the more you spend on a jacket the lighter and thinner the fabric will be. Breathability will improve as well, letting your sweat evaporate quickly.

Gore Windstopper is popular fabric laminating a lightweight membrane to the fabric. It’s designed to keep the wind out and will also help shed light rain too.

Other systems will include an inner lining, middle windproof membrane and then the outer layer, usually treated with DWR water repellency. This design keeps the wind out while staying breathable.

We’ve put together a technical fabric guide for clothing detailing the key fabrics from some of the biggest brands in the industry.

Gore Windstopper Jacket

Fit

Windproof jackets come in many styles, so choose the type best suited to your riding. If you plan on training or racing, then a tighter fit with minimal excess fabric will help prevent drag as you ride.

If you’re commuting or riding off-road then a loose cut with more freedom of movement is a good option.

Cycle Specific Features

Bike Jacket Drop Tail

Extended drop tail:

Keeps your lower back protected from the elements

Bike Jacket high waist

Raise waist:

Stops excess fabric bunching up and causing discomfort

Bike jacket preshaped arms

Pre-shaped (articulated) arms:

For greater comfort when in a cycling position

Bike jacket longer arms

Longer arms:

To ensure full coverage when cycling

Bike jacket waist gripper

Waist gripper:

Prevents the jacket from riding up

Bike jacket velcro cuffs

Velcro cuffs:

Offer a tighter fit to eliminate cooling breeze

Bike jacket high neck

High neck:

Provides more coverage

Bike jacket rear pockets

Rear pockets:

For stashing ride essentials, a security chest pocket is also a good feature

Bike jacket full length zip

Full-length zip:

With a good puller for easy use with thick gloves on and a zip garage to stop chafing

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Delivery & Guarantee

UK Delivery Information

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.

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