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Make sure you have a secure grip on the MontBell Men's Tachyon Jacket when you pull it out of your pack; at just 1.6 ounces, this featherlight windbreaker would be in danger of being taken on a ride by a stiff breeze. The Polkatex DWR finish shrugs off surprise thunder showers and the underarm mesh inserts keep you comfy when you're on the move.

  • Ultra-lightweight Ballistic Airlight ripstop nylon shell fabric is 1.5 times more abrasion-resistant and three times more tear-resistant than heavier ripstop
  • Tight weave of nylon adds wind-resistance and a soft, silky feel
  • Polkatex DWR finish provides reliable protection from wind and water
  • Full zip front provides a secure closure
  • Mesh inserts beneath the arms supply ventilation
  • Jacket weighs in at a feather-light 1.6 ounces
  • Elastic cuffs seal around wrists to keep weather out
  • Reflective accents increase visibility in low light conditions

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MontBell Tachyon Jacket - Men's

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Here's what others have to say...

4 5

Light as a feather

  • Familiarity: I've used it several times
  • Fit: True to size
  • Height: 5' 10"
    Weight: 160 lbs
    Size Purchased: Medium

Not amazing in any category other than weight. It keeps some wind out. I use it over a fleece and under a down in my cold layering system an is perfect for that. Also perfect emergency backup.

4 5

Light but tight

  • Familiarity: I returned this product before using it
  • Fit: Runs small

I recently purchased, but then returned this jacket. It is super light and has nice ventilation under the arms. However, the small size had a very slim fit and there was no way I could wear this over anything but a thin base layer. I ended up exchanging it for a Patagonia Houdini since I decided that I wanted the hood after all

4 5

The lightest top ever made?

  • Gender: Male
  • Familiarity: I've put it through the wringer
  • Fit: True to size

I've use this windshirt for over 700 miles of backpacking in Colorado, Utah, and the PCT.

-The lightest top I've ever seen. Even wispy running tanks weigh more. This is THE reason to buy this jacket in my opinion. Most other windshirts weigh twice as much as this. It's the same 7D fabric used on the EX-Light and Plasma 1000 down jackets.
-Packability: I think this is actually less volume than a snickers bar. You can fit in your mouth (don't try without adult supervision). You can fit it literally anywhere in your pack that's already bursting at the seams. There is a small pocket that you can store it in, but the pocket is so tight it's not worth the time to stuff it in there, or to store anything else in.

-Not as breathable as other windshirts, but not horrible since it has mesh pits. The Patagonia Houdini blows this out of the water in terms of breathability, though. For backpacking, I take this off as soon as I start to sweat. For running I prefer the Houdini. For cycling, this jacket is useful for summer days where you might want a jacket for a long descent in the mountains since it takes up such little volume.
-Not as warm as other windshirts. There aren't any draw cords on this. So get it as tight as possible to keep drafts out. I'm 6'2"/175 and I have a small. Doesn't have a hood, either.
-The worst thing about this jacket is using it when your arms are covered in multiple days of sweat, grime, dirt, and sunscreen. The fabric sticks to your skin and it feels awful. But I was willing to deal with it for the weight.

4 5

You'll find this in your pack a lot

  • Familiarity: I've put it through the wringer
  • Fit: True to size

At first glance I thought this jacket had limited usefulness because of it's super-light weight. However, it is surprisingly versatile. Wear it over a soft shell for wind proofing, under a jacket to create dead air space and heat retention.

In changeable conditions, it's so easy to stuff this in a pocket and forget about it-until it rains, the wind comes up or temps drop suddenly. Then you'll be glad you have it.

Lack of pockets isn't a big deal as you probably have other pockets and this should be considered a supplemental piece of clothing that can bail you out of a cold uncomfortable hike or bike ride.

5 5

1.54 oz. light!

Wow, after one week, I couldn't be happier! Not many companies make a wind shirt like this, and NONE of them make it so light. My brother has a Stoic Anorack which works great (has a hood) but it isn't available any more. Soo.. Enter the MontBell Tachyon.

It weighs literally almost nothing and fits great on me (140lb 5'8" ordered small). Blocks wind perfectly and bundles up into a tiny pocket when it isn't needed. It even fits in my fanny pack! Perfect for mountain biking and hiking on the Tahoe peaks. The mesh under the arms is a really nice touch to help regulate heat. I'll add to my review after a couple hundred miles of hiking.

It's obviously not as durable as a 17oz goretex jacket. You are paying for an unbelievable weight/space savings. As an ultralight hiker, this is as good as it gets.

I love MontBell and will continue to buy their products. I dig being able to order them from

**EDIT** After over a month and over 100 miles in this jacket, I am still a HUGE fan. Hiking in the Sierras means unpredictable wind and this thing is perfect for it. I keep it in my fanny pack while hiking and throw it on whenever the gusts get intense. It was essential on a recent hike that incuded 80mph ridge gusts.

Rock on MontBell!

1.54 oz. light!