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Black Diamond
Couloir Harness

4.5625 out of 5 stars
16 Reviews
Color:Ultra Blue/Black


Size Chart


Why We Like The Couloir Harness

With no bulk and all strength, the Couloir is an essential on our big mountain pursuits. This harness packs down to the size of an orange for compact stashing, while the adjustable leg loops clip open, letting us kit up without removing our skis or crampons.


  • Featherweight harness for conquering snowy peaks
  • Hydrophobic material resists moisture to stay light and dry
  • Self-locking speed buckle for quick-and-easy fit adjustments
  • Full-strength belay loop for glacier travel
  • 2 webbing loops keep crucial gear at the ready
  • 4 ice clipper slots for gear organization
  • Ice screw slot in each leg loop helps reduce clatter
  • Item #BLDZ9G3
Responsible Collection
Bluesign Approved
vari-width Dynex monofilament
[waist] Speed Buckle (self-locking), [leg loops] clips
Gear Loops
2 webbing
Ice Clipper Slots
4 (with ice screw slot in each leg loop)
Claimed Weight
Leg Loops
Manufacturer Warranty
1 year
ski mountaineering, mountaineering

Overall Rating

4.5 based on 16 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 1 reviews
3 Stars - 0 reviews
4 Stars - 4 reviews
5 Stars - 11 reviews

What do you think about this product?


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4 out of 5 stars

May 27, 2024

Light weight and easily packable

Purchased this for a mountaineering trip coming up, I can already tell this will be the go to for many adventures. It is easy to get on and off with with all my layers; seems to have the right amount of loops and feels light and comfortable. I give it 4 stars because I need a little more time with it in action.

Originally reviewed on

5 out of 5 stars

May 12, 2024


I purchased this for a Rainier climb and other ski mountaineering objectives. This is replacing my old Momentum harness due to its low weight and simple put-on and non-step-through features.

Ryan M.

Originally reviewed on

5 out of 5 stars

April 9, 2024

Small, light, effective

Perfect for ski mountaineering or glacier travel. Takes up almost no space in the pack & dries fast.

Jim H.

Originally reviewed on

4 out of 5 stars

February 23, 2024

Good Alpine harness

The belt is relatively easy to manipulate but (and this has been a problem with other BD gear I have) the plastic buckles are difficult to manipulate especially with gloves on. The other problem I have with this is the two front elastic straps are sewn in at the wrong angle and they rotate the harness crotch strap. It’s not really a problem but it’s a detail that would be nice if it was corrected.

Pete E.

Originally reviewed on

5 out of 5 stars

October 25, 2023

Light weight, genius design, has

Light weight, genius design, has its own dedicated belay loop.

Justin C.

Originally reviewed on

4 out of 5 stars

October 17, 2023

Safety Lingerie

Tiny harness! So much easier to pack in for long approaches to where you finally need to wear it. The gear loops are tiny and essentially weightless, so I wish BD had put four on there instead of only two.

Bret S.

Originally reviewed on

5 out of 5 stars

October 16, 2023


For anyone on ski patrol and have considered a harness for lift evacuation, the Couloir harness works perfectly. Easy to put on while sitting on the lift without dropping your skis. Nicely done BD!

Brandon F.

Originally reviewed on

2 out of 5 stars

July 28, 2023

It won't catch your fall

It might seem like a great light weight harness, perfect for mountaineering...I thought so too, but let me tell you this harness won't save your life, might as well travel glaciers unroped. The buckle system will fail around your leg loops. I took it for a slight scramble with a friend, I slipped and my friend caught me on the rope (fell less than 6inches), it was enough force to snap both the buckles open on the leg loops. I tried it again. I was practicing self crevasse using prusiks to climb out at home, the wight of me just sitting in the harness made the leg buckles snap out again. I weigh 152lbs pretty. Don't buy the harness. Buy one with out the plastic buckles.


Originally reviewed on

5 out of 5 stars

June 29, 2023

Nifty and light package

Very well made and easy to use. The infinite loop idea is $$$

Vernon M.

Originally reviewed on

5 out of 5 stars

June 9, 2023

Ultralight harness

I tried the Couloir and the Petzl Altitude and found the Couloir to be more comfortable. I would definitely go for this version with the adjustable leg loops. This harness is about 1/4 the pack size of my sport climbing harness and half the weight. But don't buy this unless you have a specific purpose, it has no padding and is not comfortable for sport climbing.

David R.

Originally reviewed on