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Code: CS17508
Castelli Alpha Ros Light Cycling Jacket - AW19

Castelli call it a light jacket, but the comfort range is surprising. It dips well into temperatures where you might normally reach for a full protection jacket, yet the surprising breathability makes it still comfortable in temps when you may have worn arm warmers and a vest in the past. We call this functional waterproofing because while we don’t guarantee that no drop will ever enter the jacket, we promise you that this is our best effort to keep you warm and dry in the widest range of conditions.

RoS stands for Rain or Shine. It’s a label Castelli give to their most advanced products that excel in both dry and wet conditions. For dry conditions, you’re looking for comfort along with breathability to prevent you from getting wet and chilled from the inside. But with wet-weather clothing, you’re looking for protection that will help you stay warm by keeping the rain out and letting sweat escape. The Alpha RoS Light Jacket ticks both of those boxes. Both the front and back materials represent a significant step forward in rain protection. These fabrics are used with reduced seaming, and seam sealing where necessary.


  • Lightweight double-layer wind jersey with significant rain protection
  • Windstopper® 150 front and sleeves
  • Nano Flex Xtra Dry back for the most significant nonmembrane water protection available
  • ProSecco Strada inner liner with 2nd front zip
  • Waterproof YKK® Vislon® zipper
  • Articulated collar that fits better whether you’re standing or riding
  • Front zippered pocket
  • 3 rear pockets with reflective laser-cut drain holes
  • Raw-edge waist lies flat and moves with you
  • Advanced patterning makes for excellent close-to-body fit
  • Weight:380g
Mr keyes Believe the hype!! Very light jacket but no issues with warmth just wearing one baselayer from 2-7 degrees, can overheat if it gets any warmer on climbs. Been in a few showers, no problem at all. very well made, race fit. I'm 5 8 and 68kgs, small fits perfectly. Bought at amazing price, fresh in orange, will be worn throughout winter.
Claudio Great cool weather jacket. Inner can be unzipped on warmer days. Have used in range 6 to 12 degC on fast rides and have no complaints.
Dr Downer Excellent product for long rides on those mixed weather mornings where it starts cold and warms up.
Gabor from Budapest The same beautiful quality garment than the deep-winter Alpha ROS Jacket. The construction is the same, only the polar inner jacket is thinner. Love for the first sight :-)
Alyosha The best jacket money can buy. A little on the small side.