Men's Alpha Merino Air Jacket

30 reviews

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Cool to cold, primarily dry conditions when light weight and breathabiliy are the priority.


Using the latest and most advanced version of Polartec’s renowned Alpha insulation, by adding merino wool, the Alpha Merino Air jacket punches way above its weight in terms of warmth, breathability and performance. Alpha Wool is used as interior insulation on the sleeve, front and collar, while Pertex Quantum Air provides an ultralight wind and water resistant barrier to help trap heat while maintaining class-leading breathability. The back panel of the jacket is made from fleece-backed italian milled recycled polyester to aid in breathability and mobility.

Likely our most technical riding jacket ever, the Alpha Merino Air uses our proprietary 3D patterning and carefully engineered on-bike fit for a super streamlined fit and covering a wide range of temps and conditions.

"Velocio's Alpha Merino Air Jacket might just be the best winter jacket we have tried."
- Dan Chabanov, Bicycling

The Velocio Signature Guarantee

The Velocio Signature Guarantee underscores our mission to create a better cycling experience. We believe that riding in our gear is the best proof of our commitment to quality and performance. Therefore, we stand behind everything we make. Try any of our products for 30 days to ensure it meets your needs. Wear it. Ride in it. Wash it. We believe it will provide a better riding experience. If you are not 100% satisfied with your Velocio product, you may return it within 30 days of receiving the product.

See our complete return policy


The key to warmth without weight is the all-new Alpha Wool from Polartec. This novel version of the award-winning Alpha insulation incorporates merino wool fiber for added thermoregulation and moisture management. The body, sleeves and collar are all lined with this super soft and breathable insulation layer.


The back panel of the jacket is made from a special recycled microfleece-lined, Italian-milled polyester, providing the highest levels of breathability while maintaning stretch for mobility, and a super soft touch.


Using a similar patterning to our proven Signature Softshell Jacket, the Alpha Merino Air features 3D patterning for exceptional on-bike fit.


Sizing Guide

Our jerseys and bib shorts are intended to be form fit, providing compressive support, maximizing performance of the fabrics, and reducing fatigue and chafing. Due to the compressive nature of the fabrics, you will be able to fit into more than one size. Please use the charts below to help determine your optimum size:

  • Find your weight along the top of the table.
  • Look down the column to find your appropriate size.
  • Each size has a height range based on weight.
  • If you find that you are on the upper or lower end of height and weight for a given size, the garment will have more or less compression respectively.
  • Use the Dimensions Details chart to further dial in your fit.

Still unsure or need help? No problem! Email us at Remember that every piece is backed by our Signature Guarantee.

Height & Weight Size Ranges

Our sizing chart represents the majority of riders we’ve worked with first hand in our clothing. If your size falls outside of the specified chart, please contact customer service for insights or take advantage of our Signature Guarantee which allows for testing and return within 30 days if your riding experience, including fit, isn’t improved.

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  • Size 120 - 130 lbs. 130 - 140 lbs. 140 - 150 lbs. 150 - 160 lbs. 160 - 170 lbs. 170 - 180 lbs. 180 - 190 lbs. 190 - 200 lbs. 200 - 210 lbs. 210 - 220 lbs. 220 - 230 lbs. 230 - 240 lbs. 240 - 250 lbs. 250 - 260 lbs. 260 - 270 lbs. 270 - 280 lbs. 280 lbs +
    XS 5'3" 5'8"
    S 5'5" 5'11"
    M 5'9" 6'4"
    L 5'9" 6'5"+
    XL 5'9" 6'5"+
    XXL 5'9" 6'5"+
    XXXL 5'9" 6'5"+
    XXXXL 5'9" 6'5"+
  • Size 54 - 59 kg 59 - 64 kg 64 - 68 kg 68 - 73 kg 73 - 77 kg 77 - 82 kg 82 - 86 kg 86 - 91 kg 91 - 95 kg 95 - 100 kg 100 - 104 kg 104 - 109 kg 109 - 113 kg 113 - 118 kg 118 - 122 kg 122 - 127 kg 127 kg +
    XS 160cm 173cm
    S 165cm 180cm
    M 175cm 193cm
    L 175cm 196cm+
    XL 175cm 196cm+
    XXL 175cm 196cm+
    XXXL 175cm 196cm+
    XXXXL 175cm 196cm+

Dimension Details

  • Size Chest Waist Hip
    XS 33" - 35" 27" - 29" 34" - 36"
    S 35" - 37" 29" - 31" 36" - 38"
    M 37" - 39.5" 31" - 33.5" 38" - 40.5"
    L 39.5" - 42.5" 33.5" - 36" 40.5" - 43"
    XL 42.5" - 45" 36" - 38.5" 43" - 45.5"
    XXL 45" - 48" 38.5" - 42" 45.5" - 48"
    XXXL 48" - 51" 42" - 45.5" 48" - 50.5"
    XXXXL 51" - 54" 45.5" - 49" 50.5" - 53"
  • Size Chest Waist Hip
    XS 84cm - 89cm 69cm - 74cm 86cm - 91cm
    S 89cm - 94cm 74cm - 79cm 91cm - 97cm
    M 94cm - 100cm 79cm - 85cm 97cm - 103cm
    L 100cm - 108cm 85cm - 91cm 103cm - 109cm
    XL 108cm - 114cm 91cm - 98cm 109cm - 116cm
    XXL 114cm - 122cm 98cm - 107cm 116cm - 122cm
    XXXL 122cm - 130cm 107cm - 116cm 122cm - 128cm
    XXXXL 130cm - 137cm 116cm - 124cm 128cm - 135cm
Customer Reviews
5.0 Based on 30 Reviews
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United States United States

remarkable jacket, one small thing...

Really impressed with this jacket over a surprisingly wide range of temperatures. Fit is accommodating, but still feels like a jersey. My one disappointment is the lack of a small, secure zippered pocket like you find on Velocio jerseys. It's a minor thing, but actually makes a real difference for me. Still giving 5 stars because the jacket is so exceptional otherwise.

  • Size purchased L
  • Product fit True to size
Charles D.
United States United States

Amazing Jacket

This jacket is amazing! I have only used it once but can immediately tell it will be my go to jacket for winter riding. I used it in 40 degree temps with the 210 baselayer and was perfectly comfortable. I think I could easily ride in the low-30s with this setup. It breathes well and the fit is perfect. The Pertex Quantum outer layer should provide some protection from light rain, but I haven’t tested this out yet. I love the alpha merino wool inner layer in the front to protect you from the wind and it is super comfortable around the collar. The back is a fleece layer. I am 5’8 with 38 inch chest and went with a medium which the size chart recommended. I also have a Signature jacket in the small size which is a little tight for me.

  • Product fit True to size
  • Size purchased Medium
A Velocio Customer
Chad C.
United States United States

Warm lil' thing

Love this jacket so far. Very lightweight when unboxing and worried it might not be as warm as i'd hoped. Ridden with it this past month in 5-32 degree ranges with the local college road team on base rides and so impressed with its warmth. The Alpha Wool is for real. If its 20-32 I'll run a normal sleeveless jersey under the jacket for the extra pockets and its all I need. The jacket is too warm for 45+ in my book. Back pockets are deep and sweetly stretchy for easy in and out action. The jacket fits good on the bike and is built to fit for that more than walking around, so feels a lil weird off the bike. My best winter riding jacket ever and soooo much better than all those heavy, thick winter thermal jackets of my past seasons.

  • Product fit True to size
  • Size purchased xl
United States United States

Pretty Much Perfect

Really a nice jacket, I've worn it about 6 times in the last few weeks. I'm not sure how warm it would be under 40 degrees without a very heavy base layer, but for the 40's to low 50's it is now my go to jacket. The visibility of the Fire Red (orange actually) is greatly appreciated.

  • Size purchased Large
  • Product fit True to size
Evan E.
United States United States

Best Winter Jacket I’ve Tried

I’ve used this jacket now in temps (F) ranging from the mid 40s to around 22, and it’s performed very well. I’ve yet to be too hot or too cold. The combination of a windproof front and a breathable back works great, and the fleece is cozy and warm. Also noteworthy is the well designed collar—high, wind proof and fleece lined. The zipper is operable one handed, even with “lobster” type gloves, another welcome feature. I’ve noted that it runs small (I’d say slightly small) because going by the Velocio fit guide I would take a medium. The large is snug at the waist for me (165 lbs, 5’10”) and there’s just room enough for a heavy merino LS jersey beneath it, although so far, even in the low 20s a light LS base layer is all I’ve needed. It’s very lightweight, which is great, but I do have some concerns regarding the long term durability of the face fabric.

  • Product fit Runs small
  • Size purchased Large

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