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Fly Alpine Harness

2 out of 5 stars
1 Review
Current price: $49.98 Original price: $99.95
50% off


Size Chart


Fly Harness

Petzl's Fly Harness is an ultralight, ultra-packable harness designed for mountaineering on skis, crampons, or boots. No matter what your feet are attached to, you can slide into this harness without raising a leg. The innovative, buckle-free design includes forgoes weighty metal buckles for a clever sliding toggle at the waist and girth hitches at the leg loops. Petzl's FuseFrame technology allows you to remove the foam padding to decrease weight and increase packability. 


  • Ultralight harness designed for ski mountaineering
  • Buckle-free construction includes a sliding toggle at the waist
  • Leg loops adjust via girth hitches
  • FuseFrame technology utilizes foam you can remove to lessen weight
  • Two gear loops and four additional loops for gear organization
  • Four ice screw slots at leg loops
  • Item #PTZZ20I
polyethylene, polyester, nylon
sliding toggle
Gear Loops
Ice Clipper Slots
Claimed Weight
Leg Loops
adjustable, girth hitch
Manufacturer Warranty
3 years

Overall Rating

2 based on 1 ratings

Review Summary

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

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

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2 out of 5 stars

June 4, 2022

Lacks features for woman ski mountaineer

I've put it through the wringer
Size Bought:
5' 2"

I love the idea of the harness, with the stretchy waistband to accomodate heavy breathing during high output activities. Unfortunately, it lacks a few features that would make it perfect for a woman ski mountaineer. The biggest issue is it is very difficult to go pee wearing this harness. I know some women mountaineers use a funnel, but that requires pants and baselayers to have a fly (which mine don't have). The biggest issue is how difficult it is to reattach the elastic sliding toggle at the waist when hands are cold. In order for the harness to fit properly, you have to wear it true to size. And that sliding toggle is just so hard to do during transitions. The other feature lacking is a clip on the back where the leg loop elastic attaches. If it had a clip in the back, it would be much easier to have a quick transition to pee. I've used this harness on two high-altitude ski mountaineering expeditions that involve extensive glacier travel. Staying adequately hydrated at high altitude is positively correlated with performance and frostbite avoidance. With hydration comes the need to pee. Unfortunately, I won't be using this harness again because of the lack of features with women in mind. It doesn't seem like this harness was tested by women athletes. I'd love to see companies test on athletes of all genders, especially for their highest performing, lightest weight gear.

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