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Castelli Alpha Ros Light Jacket

Our model's size & fit
Our model is 1,83 m tall, has a chest size of 103 cm and wears size XXL.
Chest circumference in cm
Size EU
View the stock

  • Free tracked delivery
  • Trustpilot review 9.3 out of 40.725 reviews

Pros & Cons

  • A highly functional jacket in both wet and dry conditions.
  • Excellent breathability since not all the seams are taped off.
  • Not all seams are taped off so water can eventually find its way in.


Brand Castelli
Fit Regular-fit
Windproof Yes
Waterproof Yes
Zippered pocketYes


The Castelli Alpha Ros is a lightweight and warm long sleeved jersey. The Alpha Ros has been given a thorough technical upgrade for this year. It has been fitted with the RoS technology, which is shorthand for Rain-or-Shine. This label is only awarded to the most technologically advanced products in the Castelli range, which excel in both dry and wet conditions. Dry conditions demand a comfortable and breathable product, which is capable of quickly moving sweat away from your skin. The rain requires a jersey which can keep you warm and dry. The Alpha RoS jacket combines both of these requirements into a single product.

The materials on both the front and rear are completely new, marking a tremendous step forwards in the field of rain protection. Only the most essential points of the jacket use taped-off seams. Castelli refers to this as "Functional Waterproofing". They can't ensure that not a single drop of rain will find its way in of course. What they can promise you is that, with the Alpha RoS, Castelli has developed a jersey to keep you warm and dry in various conditions.

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1 review
Gender Men
Collection Autumn / Winter 2018/2019 / Autumn / Winter 2017/2018 Autumn / Winter 2018/2019 Autumn / Winter 2018/2019 Autumn / Winter 2017/2018
Fit Regular-fit Regular-fit Aero-fit
Chest circumference in cm 95-98 / 99-102 / 103-106 / 107-110 / 111-114 93 - 96 / 97 - 100 / 101 - 105 / 106 - 110 / 111 - 115 97 - 101 / 103 - 107 / 109 - 113 / 114 - 118 / 120 - 125 89-92 / 93-96 / 97-100 / 101-104 / 105-108
Windproof Yes Yes No No
Waterproof Yes No No No
From £126.60 £142.00 £90.50 £121.30
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10 / 10

Hemmie, 7 December 2017

Zeer aangenaam fietsshirt voor frisse dagen in voor - en najaar


  • aangenaam warm
  • Regenbestendig
  • Licht
  • Zit zeer prettig en comfortabel


  • prijzig

All specifications

Manufacturer specifications

• The Rain or Shine concept provides insulation and breathability for cold & dry rides but with sufficient waterproofing for rides in wet conditions as well
• Lightweight, double layer fabric and wind protection with significant rain protection
• Taped seams on the shoulders & use of limited seams
• Windstopper 150 fabric on the front and shoulders
• Nano Flex Xtra Dry rear
• ProSecco Strada inside with double zipper
• Contoured collar to flow naturally with the shape of your neck in a cycling posture
• Castelli silicone gripper on the stomach to prevent the jacket from riding up
• 3 rear pockets with reflective laser-cut openings
• Rough finish at the waist so it moves with you
• Waterproof YKK Vislon zipper
• Ventilation on the rear
• Zippered pocket