• 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 10 reviews
The coolest jacket I've ever met.

I haven't been able to sleep since I first saw akinmoto's "ALPHA MOTORCYCLE JACKET 4.0" ad on Instagram. There are many different brands of jackets, but the design of "ALPHA MOTORCYCLE JACKET 4.0" won't let go of my heart.
The design of the jacket for the motorcycle I wanted was right in front of me.
When I arrived at my destination for a motorcycle and walked around, I really liked the design that wouldn't make other people think, "You came on a motorcycle, did you?"

After receiving the jacket, I was able to double-check that it was exactly the design I was thinking of.
However, the design was not the only thing I liked about "ALPHA MOTORCYCLE JACKET 4.0." It was well equipped with an inner liner to prepare for the cold, a structure for ventilation, and a space to use a protector. Especially, looking at the key ring hidden inside the pocket, I could see that this jacket was designed by friends who really enjoyed motorcycles.
The detail that fixes the hood with a magnet is also an indispensable attraction point.

Hey akinmoto friends, you guys really like motorcycles!

However, there was a caveat when purchasing a jacket.
It was a choice of size.
I could wear my usual "M" size with almost no problem.
However, I couldn't help but worry because of the notice that I should choose a more relaxed size since it doesn't stretch at all.
I am in South Korea, and there are no shops here where I can try on akinmoto's jacket. After thinking about size selection for a few days, I sent an inquiry to akinmoto and a very kind Grant consulted with me. Grant heard my size and recommended a size "s" or "m". But I was thinking of wearing an extra layer of warm clothes under my jacket in the cold winter (South Korea's winter is harsh), and I ordered an "L" size so that I don't feel stuffy when I wear thick clothes.
But I got the jacket and found out it was a bit big for me. I should have chosen the "M" size that Grant recommended, but I can't help it since I made the final choice.
I'm 170cm tall, weigh 70kg, and have a chest circumference of 100cm. If you're the same body size as me, don't choose the "L" size!

Hey RK,

Thank you so much for such an amazing review! We're so stoked to see such a passionate rider that's so excited about our gear!

We're so sorry to hear that size L ended up a little large, but if we can ever help you in any other way in the future please don't hesitate to reach out - Grant

Jonathan Kennedy
Perfect ADV/Off road combo - Looks great too

I have the Alpha pant/jacket combo and its excellent and hugely versatile and well made. Both vent really well, thermal liner feels ultra-warm too.
Staff a super supportive and quick to respond, helped me swap sizes out in a couple of days.

Hey Jonathan, thanks for such an awesome review! We're stoked to hear it's such a good combination for you!

A great jacket

I wanted to spend some time with my new Alpha 4.0 before posting a review. I'm happy to report it's been a glorious few months of riding with this awesome jacket. So far I've only worn in summer conditions with the winter liner removed, but it's super comfortable, the fit and build quality are excellent. I love the contemporary design – it looks flash-as – and I'm sure the extra visibility hasn't done me any harm either. Top it off with first-class, lightning-fast customer service and overall this has been an A1 experience.

Thanks for the review Cameron! We're really happy to hear how well the jacket has performed so far! Cheers!


I truly love this jacket. I finally wore it in the rain and it was perfect. It’s like a super comfortable ski jacket with armour. Thanks Akin for producing such a rad jacket.

Does it all

My adv bike is also my daily so I'm asking a lot from my bike and gear. My first ride in this jacket was in the rain and I'm honestly impressed at how sturdy, comfortable and dry the jacket is. It looks great, feels great, works great and was clearly designed by people who know what riders need. I'll be buying my gear here from now on, always proud to support a good Aussie company.