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Climb Ski Hiking/Trekking

CoEfficient Vest



Delivering lightweight warmth where you need it most, the CoEfficient Vest efficiently regulates your body temperature in cold conditions without restricting freedom of movement.
Item# APIT9G310LRG1

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Lightweight and highly breathable warmth where it truly counts, the Black Diamond CoEfficient Vest insulates your core while allowing for total freedom of movement—key when traveling over technical alpine terrain. An ideal addition to your layering system in any season, the CoEfficient Vest is built with Polartec® PowerDry® High Efficiency, a stretchy, textured fabric that's unique to Black Diamond.

  • Chamois-lined collar
  • Zippered chest pocket
Apparel Warranty

Apparel Warranty

We trust what we make because we use what we make. If for any reason, you’re not 100% satisfied with your Black Diamond apparel, we’ll repair, replace or refund it. No charge. No fine print. No debate. Guaranteed.


Tech Specs

Materials :   Polartec® PowerDry® High Efficiency fleece (207 g/m2, 88% polyester, 12% elastane)
Weight :   218 g (7.7 oz)
Country of Origin :   El Salvador

Recommended Use


Rated 4.5 out of 5 by 2 reviewers.
Rated 4 out of 5 by Comfort, allows great range of motion. I was hoping to use my coefficient vest in an appropriate environment, however, living in Los Angeles, this ski season has proven to be a dud so far. I usually am up in the Mammoth Lakes area this time of year quite often, but the conditions are not adequate to give you a meaningful review. I have been crying a lot and feeling sorry for myself lately. But thanks for asking. January 7, 2014
Rated 5 out of 5 by Excellent light layer I've had this vest for about a month. I'm a mountain guide and use it regularly. It has a trim fit which is nice when you need to add a quick layer on top of it (it doesn't fee bulky underneath). The stretch keeps you from feeling encumbered. October 3, 2013
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