Men's Acetylene Jacket

Style# 57745OR

A comfortable stretch layer with strategically placed PrimaLoft® Silver Insulation Eco for core warmth and Radiant LT™ fleece in the sleeves and back for breathability, our Acetylene Jacket is an Ambassador and employee favorite for alpine and backcountry adventures, or for highly-aerobic activity in ultra-cold conditions.
Trim Fit






  • Hybrid-Mapped Construction
  • Water Resistant
  • Breathable
  • Internal Front Stormflap
  • Zippered Napoleon Pocket
  • Two Zippered Hand Pockets
  • Thumb Loops
  • Stretch Binding at Cuffs
  • Drawcord Hem


Fit: Trim Fit

Fabric 100% polyester 20D ripstop shell front and back yoke // Radiant LT™, Fleece, 94% polyester, 6% spandex lower back and sleeves // 100% nylon 30D embossed taffeta lining // PrimaLoft® Silver ECO Insulation 100% polyester

CENTER BACK LENGTH: 28¾” / 73 cm (L)

Avg. Weight (oz./g): 14.7oz / 416g (L)

Customer Reviews

Great for fat biking (Review by Mason)

This is a great mid layer for cold days skiing, biking, and many other active winter sports. I have been using it as an outer layer and as an insulating layer while fat biking in the Colorado foothills. Fat biking uphill is pretty high exertion and breathability is really important. The lightly insulated front keeps most wind out and the highly breathable arms and back reduce sweating dramatically. I generally throw a layer over it, typically the Ferrosi hoody, for the descents. I do not love the appearance of the jacket as it is a little unusual looking but the jacket works great for its intended purpose. The sleeve material does "pill" a little but that is after many days of use and a fabric shaver took care of that and made it look good again. Great jacket!

(Posted on 2/12/15)

Perfect jacket (Review by Taylor)

Deceptively warm, incredibly packable, looks nice enough to wear out to a bar, and useful enough to wear for outdoor sports.

This jacket is the perfect mid-layer under my motorcycle jacket for winter riding, and great as a main layer for everything else between 34-50 degree temperatures..

(Posted on 12/5/14)

Amazingly Versatile Jacket (Review by Matthew)

Have had this jacket for about a month and absolutely love it! It thin and light weight yet deceptively warm. I've worn it under my OR soft shell as a perfect complement. I used it for a trail run in 30F conditions over the top of my long-sleeved zip tee. It performed perfectly. I have not yet used it for backpacking but expect that it's design will be ideal for keeping the chest and core warm while allowing breathability through the back. I've also received numerous compliments on its stylish look as well.

(Posted on 11/29/14)

Really awesome performer (Review by Old Goat)

Really love this jacket. It compares well to other hybrid type jackets, and in my opinion, performs and fits better.

(Posted on 4/7/14)

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