• Protective Maxtex® 600 D outer shell for superior abrasion resistance
  • Armour compatible* (shoulders, elbows, back) - *sold separately
  • NEW Waterproof Humax® membrane (14,348mmH2O) and highly breathable (19,241g/m2/24 h)
  • Fully Seam Sealed construction
  • NEW SmartVent System - 5 x airflow vents
  • NEW Removable Thermoline® thermal lining
  • NEW Removable Wrist Gaiter design - attached to thermal liner
  • NEW Reflective logos
  • NEW Improved fit for optimal performance and comfort
  • NEW Removable hood with magnetic keeper
  • NEW Hidden key/fob clip in front pocket
  • Water resistant pockets with premium YKK® Aquaguard® zippers
  • 2-way YKK® Vislon® main zipper with storm flap - Easily adjust the bottom of the jacket depending on your riding position
  • Comfort lined collar, cuffs and hand-warmer pockets

We’re proud to introduce the 4th generation our Alpha Jacket. Our best jacket, just got a whole lot better!

I know what you’re thinking… “what’s different compared to the old Alpha Jacket”? We’ve spent the past 2 years riding all over the world, taking notes of ‘all the small things’ that we could improve. More importantly, we listened to YOU. Your emails and reviews had some hidden clues on ways we could improve the design… and we’ve been paying attention.

We’ve stuck with the classic Protective Maxtex® 600 D outer shell for superior abrasion resistance. For added protection, we’ve designed the jacket to be 100% compatible with body armour inserts for the back, shoulders and elbows (sold separately). NEED ARMOUR? CLICK HERE.

Cold weather? We’ve improved the removable Thermoline® thermal liner, plus added built-in wrist gaiters to help block cold wind from entering your sleeves.

Warm weather? Zip-out that thermal lining and open the new SmartVentTM System (with a total of 5 zipper vents) for maximum air circulation, keeping you cooler.

With a total of 5 large pockets, you’ll have plenty of room to stash all your valuables on your next ride. We’ve added a magnetic keeper to the removable hood (to stop it flapping around), there’s a hidden key clip in the front pocket for your key/fob, reflective logos for extra visibility and premium YKK® zippers all round.

Built for the worst conditions – Fully seam sealed + our new Humax® membrane features a huge 14k Waterproof + 19k Breathability rating, resulting in the ultimate protection against rain, wind and snow. (14,348 mmH2O + 19,241 g/m2/24 h)

We’ve built the new Alpha Jacket to take you wherever you want to go. From mountain peaks, to city streets. Around town, or around the world. The Alpha 4.0 Motorcycle jacket is ready for it all.


The Alpha Jacket has ZERO stretch. We recommend that you choose a size that will fit 'loosely' on your body.

The best way to find out your size is to measure a jacket you already own, and that fits 'loosely' while on your bike (factoring in any garments you wish to layer underneath). Being a lot thicker than most other jackets this adds to the overall chest width of the jacket. We encourage customers to measure something that's a similar style (such as a snow or a thick technical jacket) as this will ultimately be the best comparison in chest width.

Measure by laying your jacket flat on a table, and measure the chest, making sure to go from side seam to side seam (near the armpit like in the photo below). It's very important that you reach the seam join on each side, even if you have to bend a little around the sides of the jacket. Compare your measurement to the size chart above.

If you're unsure of your size, please EMAIL US at, especially if you are an international customer. We are here to help and will do whatever we can to make sure you order the right size.

Model in the photos is 6ft, 83kgs, has a 100cm chest and is wearing a size Large.

Alpha Jacket How to Measure

Questions? Email us at You’ll be talking directly with someone who rides and has tested our gear. 

Customer Reviews

Based on 14 reviews
Happy customer.

I bought both the Alpha Motorcycle Jacket 4.0 and Alpha motorcycle pants. I got the sizing wrong; Grant was extremely helpful with the exchange to an X-Large. I’m 185cm tall and 85kg. The Large was a bit tight. If you’re unsure about your sizing email Grant before ordering which saves time and effort. I spend 10 hours on the road back from WSBK Phillip Island yesterday and I was comfortable all the way home. Thanks Team Akin!

Thanks for such a great review D! That's so awesome to hear how comfortable the gear was on the ride back from Phillip Island and I'm stoked that we could help you out to get the right size gear. Definitely for anyone chasing the perfect size their best bet is to email us first and we'll happily help out. Cheers again! - Grant

Nice, very nice

I've picked up a couple of things from Akin now and this is the same excellent design and quality as the others. Features I like are the big, adjustable sleeves to take winter gloves when the time comes or scoop air up on the hot days, pit zips, front and rear ventilation, wrist gaiter (brilliant idea). Good materials and really well sewn also. Quality.
One note is the interior pouches for armour are designed to fit the ones they sell. Tried some from other brands I had (Merlin, Sidi, Triumph, Revit) but don't fit so good. I'd recommend getting theirs using the bundle discount.
Great service as well. Received an email after I ordered it from Grant to say thanks for buying again. Who does that?

Hey DC, so stoked we could continue to impress you with the new gear and we really appreciate the support! Cheers for covering all the features you love as well, that's awesome! Thanks again! - Grant

Kostas T.
Great All around Jacket

As a European citizen, ordering a motorcycle jacket overseas without even testing it and with extra duties cost sure was a risk, and i am glad i took it! All around a great comfortable and warm jacket that's unique to the eye and doesn't come with the "usual buffiness" of the motorcycle jackets. If AKIN came officially to Europe, i would probably fill my motorcycle closet with their stuff.

Thank you so much for the review and for taking the chance with us Kostas! We definitely know the risk when ordering from overseas. We hope you continue to love the gear and hoping to look after you again in future!

Zeb McCosh

I've been meaning to do this earlier as bought my jacket back in July but only had it a week before I hit the deck. It was one of those combo Tar Seal/ Gravel Roads, going too fast on less-than-ideal tyres so it wasn't slowing for the corner. I was fully locked up and instead of ending up in a deep water filled culvert I tried to correct and high sided. Landed on head & shoulder with Helmet and bike being written off but Alpha totally unscathed. Not only does it look cool, is super functional but is the real deal when it comes to keeping you safe. Kind of the Dan Carter / Ranaldo of MC Jackets.

Bloody helpful, amazing service as well.

hugo hernandez
High Quality Jacket. Great price!

Right out of the box you can tell it’s a quality jacket. A lot of thought was put into the construction and features. The major selling point for me are all of the air vents, which I definitely felt while riding on the highway. The jacket performed well on my recent camping trip and kept me warm without the thermal liner installed. Cannot wait to test it out on rainy weather. My only gripe is: thermal liner should’ve come with inside pockets.