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Castelli Alpha Ros Light Jacket - Light Black


Is it a jacket? Is it a jersey? Either way, it's Castelli's near perfect compromise - allowing you to stay dry and warm in an amazing range of conditions

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Castelli may call the Alpha Ros W Light Jacket 'light', but the range of conditions that it thrives in is remarkable. In truth some people think of it as an ultra-adaptable long sleeve jersey. It will keep you comfortable in temperatures where you might normally dig out your full weight jacket, and yet the exceptional breathability ensures it's still ideal on days when you might otherwise have worn arm warmers and a gilet in the past. AND it keeps you dry.

RoS stands for 'Rain or Shine'. What does it mean? Well, for a start it's a label that only Castelli's most technically advanced products are awarded. And every RoS product must excel both in the dry or the wet. In the dry, that means serious comfort and real breathability to avoid perspiration making you cold and damp. And in the wet, it will keep you warm and dry whilst still letting the heat and sweat out efficiently.

The Alpha RoS W Light Jacket fits the bill comfortably on both fronts. The material used offers cutting edge rain protection, and Castelli have managed to reduce seaming and sealed the seams where sensible for keeping the wet out in all conditions barring prolonged monsoons!

According to Castelli, this is 'functional waterproofing' - it's essentially the best possible balance that they can achieve between water repellency and breathability. And in our experience of the Alpha Ros Light, that's a pretty spectacular achievement.

Size Guide

Castelli Size Guide

Note: where Castelli once had a reputation for making gear that suited only very small Italian people, the Castelli women's size scale is now very similar to 'normal' UK sizing.


VeloVixen Size  Chest A Waist B Hips C Inseam D
X-Small 79cm / 31" 63cm / 25" 87cm / 34" 75cm / 29.5"
Small 84cm / 33" 68cm / 27" 92cm / 36" 76cm / 30"
Medium 89cm / 35" 73cm / 29" 97cm / 38" 77cm / 30"
Large 94cm / 37" 78cm / 31" 102cm / 40" 78cm / 30.5"
X-Large 99cm / 39" 83cm / 33" 107cm / 42" 79cm / 31"

Note: the inside leg measurement is naturally less relevant for shorts than for tights! See image below for key A-D.


VeloVixen Size Castelli Size Euro Shoe Size
Small S/M 35-38
Large L/XL 39-41
XX-Large 2XL 44-47



Diluvio, Belgian Booties
VeloVixen Size Castelli Size Euro Shoe Size
Small S/M 36-40
Large L/XL 40-44
XX-Large 2XL 44-48


All Other Shoe Covers
VeloVixen Size Castelli Size Euro Shoe Size
Small S 35-37
Medium M 37-39
Large L 40-43
X-Large XL 44-46
XX-Large 2XL 46-48



 VeloVixen Size Bras (cm) (bust | underbust) Gloves (cm) (1) Warmers (jersey size / weight)
X-Small 81-85 | 65-69 <16.6
Small 86-90 | 70-74 16.6-18.4 XS-S / 45-60kg
Medium 91-95 | 75-79 18.4-20.2 S-M / 60-70kg
Large 96-100 | 80-84 20.2-22 L-XL / 70-80kg
X-Large 101-105 | 85-89 >22 2XL / >80kg

1. Measure around your knuckles with a measuring tape 


Tech Spec

  • Lightweight double-layer wind jersey with significant rain protection
  • Gore-Tex Infinium 150 front and sleeves
  • Nano Flex Xtra Dry back for the most significant non-membrane water protection available 
  • ProSecco Strada inner liner with 2nd front zip 
  • Waterproof YKK Vision zip
  • Articulated collar for a better fit both on and off your bike 
  • Front ziped pocket 
  • Triple rear pockets with reflective laser-cut drain holes 
  • Raw-edge waist lies flat and moves with you 
  • Advanced patterning creating excellent close-to-body fit
  • Weight: 340g
  • Recommended temperatures: 8-15c

Who's Behind It?

Q. What do a 19th century Italian tailor, a designer for the Milan Ballet and the first ever lycra cycling shorts have in common?

A. They are all part of a rich 140 year history that's led to today's most recognised brand in cycling: Castelli.

Throw in a heart attack on a famous Italian climb, family feuds, Olympic gold medals and controversy in the pro peloton and it begins to sound more like a Sicilian soap opera than the backdrop to a cycling brand. But then again Castelli is no ordinary brand.

Today, Castelli's scorpion emblem is arguably the single most recognised in cycling. Iconic is an overused word these days, but the Castelli brand surely qualifies.

We first discovered Castelli on our year long ride through the Americas in 2010, when our founder Liz (pictured) wore Castelli shorts and loved them, so stocking them seemed an obvious choice. But we're almost as captivated by the story behind the name as the kit itself! For the full Castelli story (it's quite a story!), click here.

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