The Dynafit Zzero 4 PX-TF Alpine Touring Boot climbs easy on the skin track, and skis hard on the descent.

With its more-forgiving Rislan PowerStringer, the Dynafit Zzero 4 PX-TF Alpine Touring Boot offers all the comfort and fit of Dynafit's C-TF model, without the carbon reinforcements. Tackle long tours and sidecountry trips alike in this four-buckle boot. Touted as the lightest four-buckle on the market, the Zzero 4 PX-TF boots grant featherlight uphills and rewarding downhills. Mid-stiff Rislan material in the instep and Powerstringer efficiently transfers energy to your glides as you hike and hold firm during sketchy descents. The Zzero PX-TF Boot's Pebax tongue flexes smoothly and consistently as you pass your skin track on the way back down, and Dynafit's lightweight, thermo-moldable Thermoflex liner insulates your foot so your toes don't end up frozen at the end of your hikes.

Share your thoughts

What do you think of the

Dynafit ZZero 4 PX-TF Alpine Touring Boot

? Share a...

Write a review

No file chosen

Rather attach a photo from another website?

Rather attach a photo from your computer?

  • Product review:
  • Share a video
  • Share a photo

How familiar are you with the product?(Optional)

Only jpg, jpeg, png, gif or bmp files please.


Here's what others have to say...

i bought a new pair of Zzero px boots ....

i bought a new pair of Zzero px boots . what kind of binding can
i use with these?

Responded on

Any tech binding (Dynafit, Plum, RTK, Sportiva, G3 Onyxx) or any of the frame style bindings with a sliding AFD and toe height adjustment (which should be anything from Fritschi or Marker but not the stuff from Atomic/Salomon). You cannot use these with an alpine binding at all.

I currently have the Bdel Factor boots. I...

I currently have the Bdel Factor boots. I find they are too tall and too heavy for large days in the BC for me. I'm wondering if these Dynafits would be a better option for climbing but also bomber enough for my Gotamas and Freeride set up? I'm actually looking for any affordable replacement. I am 5'10" 180 lbs and a pretty aggressive-style skier.

Responded on

These boots will be great as far as weight goes. They will not be as stiff as the Factors. The limiting issue may be availability. Backcountry only has size 25.0 and 23.0 left. Based on your height/weight, I bet you have bigger feet than that. A better option for the descent would be the Zzero4 U-TF (stiff & more affordable) or the Zzero4 C-TF (lighter and a bit more $).

is this a man's boot?
Does it come in...

is this a man's boot?
Does it come in woman's narrow?

what is the difference between this ski...

what is the difference between this ski boot and the ZZero 4 c-tf?

Responded on

The main difference is the use of carbon on the C-TF for lateral stiffness. The weight is virtually identical (3180 PX-TF vs. 3190 C-TF), but you pay a bit more to get the extra stiffness without extra weight on the C-TF.

Responded on

How does this affect the performance when skiing?

4 5


I have only got to do a couple trips so far but they are very comfortable for the way up and so far seem to do fine for the ride down.I am 5'9'' and 150 and wouldn't consider myself as a real aggressive skier. I would definitely recommend these for a smaller framed skier.

4 5

Dynafit yellow boot

I used these for a couple of seasons.Light and dialed,All around boot for ski mountaineering,traverses and evenon hill.Narrower fit for my narrow heel.Little cheaper than the green ones.I would recommend the intuition linersto dial the fit even better.

Dynafit yellow boot
5 5

No Problems

It was my first pair of AT boot's and i could not have asked for a better pair, i brought them on a Sunday and used them the next morning on the Haut Rout in France (Chamonix-Zermat 115miles 6days) .
I had no problems no blisters the perfect boot!

If you are looking for a light weight, comfortable boot with good downhill control then these are the boots for you.

Well done Dynafit

5 5

Wrong Weight

So, backcountry, you made a little mistake that may mislead a shopping customer. The weight listed as: 8lb 7.6 oz is so far off, its not even funny (this would make this boot one of the heaviest AT boot on the market). Do the conversion for the listed 3180g and you get a slim and sexy weight of 7.01 lbs. Don't be mislead by the carbon version of this boot either (the carbon strip is for strength and rigidity not weight saving) for this boot is a whooping 10g lighter. Dynafit says "Compared with other boots on the market, this is the lightest 4-buckle Ski Touring boot in the world."

Boom, roasted.

Responded on

Thanks mucho Wyoming Kid. Read your review while shopping for my own pair and have updated our Tech Specs per your recommendation.

Bang, served.

5 5

Review Title

First real use of these was a five mile skin over rolling terrain, at which point I replaced the skis with crampons and did a 2,000 climb (WI2), descended the same route, and skied out. All in: 10 hours in the boot and nary a problem.

Do these have a removeable sole like the...

Do these have a removeable sole like the Zzeus? If not, will they fit a Marker Duke?

how does the width of these compare to...

how does the width of these compare to scarpa or garmont? Looking for a narrow low volume boot, and these are waayyy lighter than garmonts

Best Answer Responded on

i tried on the red zzero which i think is the same last as these and it was fairly wide in the forefoot but not super voluminous. most scarpa boots have a really tall and voluminous toe box. I think overall garmonts usually have the lowest volume but sometimes the heel cup is not as deep and isn't as snug as dynafit or scarpa. These are generalizations. I only have skied garmont

Do these boots have a cant adjustment?

Do these boots have a cant adjustment?

5 5

They Rip

I've only had these boots for a few days in the backcountry so far. I'm very happy so far. They're the lightest 4-buckle boot in the world (lighter than the carbon). They're stiff enough for me (5'8", 147#, agressive skier), but if you're heavier or taller, you might want to go stiffer (ie Zzero 4 carbon or Zzeus). They're very comfortable for my feet. Match them with Dynafit bindings and agro skis and you'll be happy.
As far as touring performance goes, the tour mode seems fine to me. They don't tour like a 3-buckle boot, but also better than a heavy overlap boot. Backward cuff motion isn't an problem if you are skinning UP HILL.

How do you mould the liners? Stick them...

How do you mould the liners? Stick them in the oven? At what temp and for how long? Then what?

Responded on

what ever you do, be very careful - no info came with my boots, and after web research went conservatively to 230deg in convection oven - and they self destructed after 8 minutes!

Responded on

I set my convection oven for 210F, and keep an eye on them. Takes about 10-12m, and I flip them halfway. There's a lot more to the process, which you should be able to find.

Can AT boots be used with conventional...

Can AT boots be used with conventional alpine bindings?

Responded on

yes but the alpine binding won't release normal. The rubber sole prevents the Alpine din from being accurate so you have to do a bit of trial and error to find the right din setting. I would not recommend skiing alpine bindings with AT boots but it can be done.

3 5


Compared to similar Dynafit-compatible boots by other brands, these boots seem to have limited backwards cuff motion in tour mode. The result is that you can't stand up straight in them while skinning, and your weight ends up being carried by muscle tension instead of your skeleton. This is subtle and may only matter for those who do very big days. In terms of weight, construction, and ski performance, the boots are excellent.

Responded on

Just regarding comments about limited cuff movement. I skied 40 days on theses last year including one a near 10,000ft touring day. for me the trick is to do the power strap up just around the liner , don't put it around the tongue, and leave the top buckles totally undone. My feet stay put and I get lots of cuff motion.Having the powerstrap done around the tongue really limits the travel.

Responded on

Actually, the part of the boot that doesn't want to go backwards is the tongue support- in order to point your toe, you need to un-do the top buckles (or clip into the extendo-clip thingies on the top buckles) and undo the power strap- when you do this, you'll be able to stand straight quite easily.

5 5

Dynafit Zzero 4 PX-TF Alpine Touring Boot

Hi! I am French and I live in Maine, so forgive my English.
Those boots are my 5th Dynafit AT boots.
I usually prefer light weight for long trips and an easy uphill. I began to ski when I was 5 years old.
Those boots are the best I have ever had: still light, but more rigid than the race models, very comfortable uphill, and hot.
They are clearly softer than the carbon model, but I think it's a perfect compromise.
I have wide feet, so I had to choose 29 instead of 28.5, because they fit a little bit more narrow than the other Dynafit I had. Its downhill skills are far better than all I have seen before in the brand.
Conclusion: they feel rather like perfect all abilities touring boots than pure freeride.