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Beta RoS Jacket - Men's

5 out of 5 stars
1 Review
Current price: $167.99 - $179.99 Original price: $239.99
Up to 30% off


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Beta RoS Jacket

Castelli’s desire to have a premium cycling layer to match any condition is palpable, and the Beta RoS Jacket fills the space of protection in damp conditions but above freezing temperatures. Somewhat the rainy and foggy counterpart to the Transition 2 jacket, the Beta RoS supports rides ranging from 46-64 degrees F but receives the “rain or shine” designation thanks to its Polartec NeoShell and Nano Flex Light fabrics, which block wind and water throughout the ride.

You’ll find the Beta RoS ideal as more of an element barrier than an insulated jacket — although Castelli claims a surprising amount of warmth during cool weather riding. The front and upper sleeves receive the Polartech NeoShell barrier to fend off rain and winds facing you, while the rear is woven in Nano Flex Light to handle the less forceful rear-wheel spray. The 4-way stretch allows the Beta RoS to feel like it’s next-to-skin while supplying enough freedom of motion that you’ll be able to find it the ideal early-season racing jacket. Three rear pockets hold the standard provisions, and the large reflective panel boosts your visibility in low-light riding conditions.


  • Cool and damp weather, racing and training cycling jacket
  • Wind and water barrier on the front and rear keep you comfortable
  • Stretch fabric makes it ideal for racing and long-training rides
  • Traditional pockets holds the standard snacks and supplies
  • Add a thermal baselayer for colder rides in near freezing conditions
  • Item #CSTZ7D3
[front/upper] Polartec NeoShell, [rear] Nano Flex Light
fall, winter, spring
short (dropped tail)
Center Back Length
[large] 26in
3 rear
rear panel
Claimed Weight
[large] 8oz
Manufacturer Warranty
1 year

Overall Rating

5 based on 1 ratings

Review Summary

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5 Stars - 1 reviews

Fits Small

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5 out of 5 stars

March 5, 2022

Never underestimate Castelli Jackets

I've put it through the wringer

I already had Castelli Alpha RoS 2 and Alpha RoS Light, but picked this up to handle the temps above 55F. Was well rewarded when paired with light long sleeve base and temp warmed from 52 to 59F. Stops wind dead and and never overheats or feels swampy. Have rolled with it and a heavier base down to mid-40s very happily. Polartec carries the day beautifully. As usual for Castelli, size up if in doubt.

Brian B

Originally reviewed on