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Castelli Mens Alpha Flight RoS Jacket
Castelli Mens Alpha Flight RoS Jacket
Castelli Mens Alpha Flight RoS Jacket Tarmac/Clay-Silver Gray
Castelli Mens Alpha Flight RoS Jacket Tarmac/Clay-Silver Gray
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Castelli Mens Alpha Flight RoS Jacket 2
Castelli Mens Alpha Flight RoS Jacket 4
Castelli Mens Alpha Flight RoS Jacket 1
Castelli Mens Alpha Flight RoS Jacket 3

Castelli Men's Alpha Flight RoS Jacket

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MSRP: $319.99
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Get Wild For Mild Conditions

The Castelli Men's Alpha Flight RoS Jacket is their best jacket for mild conditions. This lightweight, super-breathable, and extremely fast jacket is great for high-intensity rides or staying at the right temperature in cool conditions. The magic comes from Alpha construction with membraneless outer layer and Polartec® Alpha inner insulation.

This is the jacket for going fast on cold days or being perfectly dressed on cool days. Alpha double-layer construction is the core of what makes this jacket work so that you can be in full flight mode when the season starts. The stretch woven fabric lets a small amount of air in to keep you from getting too sweaty during those efforts on colder days, because if you get wet you get cold. The Polartec® Alpha second layer insulates while still providing plenty of breathability, and it's so light the jacket has hardly any bulk to it. The back is made from Nano Flex Extra Dry fabric, which provides a good level of insulation yet has no membrane so allows for ample amounts of sweat to escape. The fit is close to body so there is no fabric flapping around, while the little details make the difference: easy-sliding YKK® zippers, reflective drain holes on the pockets, a lie-flat silicone gripper band around the waist. The close fit makes this Castelli's most aerodynamic jacket as well. Not that aerodynamics are terribly important in the winter, but hey, Fast Is Fun!


  • Nano Flex Light woven fabric on chest, sleeves, and upper back partially blocks wind, but lack of a membrane guarantees maximum breathability
  • Alpha double-layer construction separates wind-block layer from insulation layer, allowing better ventilation and temperature management
  • Water-repellent finish
  • Polartec® Alpha active insulation on chest, sleeves, and back for extra warmth
  • Nano Flex Extra Dry on back for more ventilation, allowing heat and sweat to escape while shedding rain thanks to a nanotechnology water-repellent finish
  • Off-set Double YKK® Vislon® front zippers
  • Zipper pocket on side to secure valuables
  • 3 rear pockets with laser-cut drain holes
  • Raw-edge waist lies flat and moves with you
  • Weight: 359 g
  • Temperature: 6°C - 16°C / 42°F - 61°F

Free Exchanges: This product qualifies for free exchanges within the first 60 days after order. We'll cover the shipping both ways for US customers if you need a different size and/or color of this product. Returned product must be in new condition with all labels and packaging. Free exchanges apply only for product in stock or available for backorder.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

Size Chart




Sleeve Type: Long Sleeve 

Tarmac/Clay-Silver Gray - Medium

Mfg PartNum: B4523506304-3 

Tarmac/Clay-Silver Gray - Large

Mfg PartNum: B4523506304-4 

Tarmac/Clay-Silver Gray - X-Large

Mfg PartNum: B4523506304-5 

Tarmac/Clay-Silver Gray - 2X-Large

Mfg PartNum: B4523506304-6 

Sulphur/Nickel Gray-Dark Gray - Small

Mfg PartNum: B4523506776-2 

Sulphur/Nickel Gray-Dark Gray - Medium

Mfg PartNum: B4523506776-3 

Sulphur/Nickel Gray-Dark Gray - Large

Mfg PartNum: B4523506776-4 

Sulphur/Nickel Gray-Dark Gray - X-Large

Mfg PartNum: B4523506776-5 

Sulphur/Nickel Gray-Dark Gray - 2X-Large

Mfg PartNum: B4523506776-6 


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