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Total comfort in brutal conditions

I'm 6ft, 69kg and I get cold very easily. Prior to getting my Alpha RoS jacket I didn't look forward to going out if it was cold and/or raining because i'd get really uncomfortable because the only way i could keep warm was multiple layers and a rain jacket, which meant i'd boil on climbs and then the sweat would chill me because the breathability wasn't there. Enter the Alpha RoS. I visited mum in Tavistock and went for a 4 hour ride over Dartmoor. The temp was 10c the wind was howling at 30-40mph, the very light rain turned into sideways medium weight rain. Although not that cold, when you're getting wet and getting blasted with wind you get cold very quickly...not with the Alpha RoS you don't - at the start of the ride down in the valley I was overheating because i was wearing my Castelli Flanders base layer, so i took that off and just wore the jacket on bare skin, which was comfortable. The jacket is incredible adjustable in the thermal protection - unzip the inner thermal layer and zip the outer, zip the inner and unzip the outer, unzip or zip both - all with gloves hands and in seconds so at the bottom of a climb you unzip and at the top you zip up - it's PERFECT. As the weather deteriorated I zipped up and after I stopped at Princetown for lunch my core temp must've dropped before I had to put the base layer back on.. The last leg back to Tavistock was brutal - crosswind so strong that I was in danger of getting blown across to the other lane, the rain was horizontal and it was cold. I however, rode in total comfort and enjoyed the sheer rugged landscape and the fact that i was out there when very few others were. If it's below 10c i'm wearing my Alpha RoS period. Thus far i've ridden it down to 2c and its' clear that it can handle much more, particularly when pairing it with the Flanders top. I have a non-thermal base layer and i'm totally comfortable in my Alpha at 4c. It breaths well and it handles rain brilliantly because although i'd not 100% waterproof it is "real world waterproof", acknowledging that you're going to get wet from sweat in a fully waterproof jacket, so it focusses on breathability so rid you of moisture (rain or sweat). I combine it with the Nano Flex 2 bib tights, Tempesta gloves and the aforementioned Flanders base layer and basically the weather is now pretty much irrelevant to me, which has greatly increased my enjoyment of riding in the winter. For someone who gets cold very easily and isn't very 'tough' - this is a miracle level piece of clothing. Before i bought it I thought it was very overpriced. Now i wouldn't be without it - you get what you pay for. Submitted on  15 décembre 2018  by  Jimbo

Great 22 out of 25 jacket

Awesome jacket does exactly what is says on the label. However how does a £260.00 jacket not receive 5 out of 5 on all attributes when it is advertised as the PERFECT jacket.. Submitted on  13 janvier 2018  by  JMB


I've been extremely pleased with the Alpha Ros Jacket. Winter training is sub 32 F degree weather is made simple knowing you'll keep warm and dry. I picked up the bright orange variant knowing it would contrast well in snowy conditions. Sizing and fit remain consistent with Castelli's Euro fit and is not bulky at all. This a very versatile piece, the key is vary your base layers based on the temperature you're riding in. I'll use a sleeveless summer base layer for warmer days or a heavy wool baselayer for the coldest of days. Overall, this is my go to jacket during the cold winter months, and I think Castelli has done an excellent job on this piece. Submitted on  03 janvier 2018  by  Renzo

Amazing Jacket

I bought this jacket for vinter / autumn period, as here in Denmark the weather can be like rainy and temp around + 3 Celsius which makes it feel really cold. So the jacket arrived and i looked at it thinking this is very thin can it do anything in the cold ! Well turns out its really really awesome jacket and it holds out the rain perfect. Even during my daily commuting to work where i also have a backpack on and i normally get wet on my back... thats not happening. Dont know how thats made possible. So even though the price is high, the quality and purpose is simply stunning. Submitted on  10 décembre 2017  by  Flemming Denmark

Qualité supérieure

Coupe ajustée, très agréable à porter ! Isole parfaitement du vent. C’est un vrai plaisir de rouler avec cette veste. Submitted on  20 novembre 2017  by  Serge

Wonderful piece of technological kit

I wore this jacket today and I must say that I was impressed. When I started my ride it was -1*C. I wore this jacket, a long sleeved “early winter” base layer from another brand (which we won’t mention) and a bibtight with frontal wind protection. Paired with a mid weight glove and Castelli’s Toe Thingy and Castelli Merino wool socks with a very light head beanie and I was perfectly comfortable for my 2hr ride. I even unzipped for some of the climbs. The Gore wind protection prevents any of the cooling effects from evaporation and the jacket feels very breathable. I normally wear a size large in Castelli jerseys but with this jacket, I ordered an XL and fits perfectly. For reference I’m 5’-10”; 185lbs. and built a bit square with a slightly shorter legs(31”) inseam. It’s beautifully crafted and worth the price of cold weather admission. Submitted on  12 novembre 2017  by  John P


I purchased this jacket specifically to ride in temps below 32 degrees. Got to try it out in a morning that was exactly 32 degrees. At first I was cold, but after about 15 minutes of moderate pedaling, I warmed up to a comfortable operating temp. The jacket is supposedly rated for temps between 23-50 degrees. I don't think I could ride much less than 32 degrees without another layer. To give some context, my base layer was an Under Armour ColdGear Evo Long Sleeve Compression Mock. I also have the Senza 2 jacket. In comparing the two, the Senza 2 is definitely more bulky, but feels warmer than the Alpha ROS. The Alpha ROS also has many more sewn parts, so I'm assuming the Senza 2 will hold up better from seams separation since it has fewer sewn parts. The Senza 2 feels warmer and doesn't feel as form fitting as the Alpha ROS. The Alpha ROS fits closer to a race fit than a casual fit. Overall, for a more casual ride or commuting to work, I'll stick with my Senza 2. For longer weekend or training rides, the Alpha ROS should work well. Submitted on  10 novembre 2017  by  Jason T

You don't want to take it off anymore!

This product is amazing and so versatile. By un-zipping the outside layer it still keeps you warm and your body can breath when climbing. Afterwards you can attack the descent without shivering. It feels just like the extra piece of skin you always searched for your winter rides. Submitted on  10 novembre 2017  by  Igor

Totally wintery!

If you ride in total winter conditions, this is the jacket. Kept me warm in low 20f. Highly recommended! (Reviewed by a Castelli employee. Proud of this product) Submitted on  25 octobre 2017  by  Sam

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Spécifications techniques
  • Technologie Rain or Shine procurant isolation thermique et respirabilité pour les sorties par temps froids et secs et bénéficiant d'une étanchéité efficace s'il pleut
  • Tissu Gore® Windstopper® 150 procurant une protection contre le vent associée à une haute respirabilité et une protection efficace contre la pluie
  • Coutures scellées sur les épaules, nombre de coutures réduit et coutures double point pour évacuer l'humidité corporelle
  • Construction Alpha: épaisseur coupe-vent et imperméable séparée de l'épaisseur isolante
  • Meilleure ventilation et meilleure évaporation de l'humidité grâce à son épaisseur isolante séparée
  • Zips étanches YKK® Vislon® partiellement couverts, faciles à monter et descendre et reposant à plat
  • Bord brut plat à la taille pour mieux vous suivre dans vos mouvements
  • Poignets bords bruts plats, offrant une interface impeccable avec les gants
  • Tissus stretch avec structure avancée offrant une excellente coupe près du corps et qui s'adapte à de nombreux types de gabarits
  • 3 poches arrière avec trous d'évacuation d'eau réfléchissants découpés au laser
  • -5°-10°C / 23°-50°F
  • Poids:515g
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