Skimo Co

Dynafit Borax Overmitt


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Wearing lightweight race gloves in the backcountry has spoiled us since the dexterity is unmatched. However, rare is the mid-winter day warm enough to wear a thin glove exclusively. The Dynafit Borax Mitten allows you to enjoy your dexterous gloves while keeping your hands warm. Slip these over your tiny gloves (on your tiny hands?) and let the Primaloft insulation do the talking (insulating). An overlapped split in the palm seals out drafts and still allows for easy access to rip skins, flip risers, or tear open a package of rocket fuel. The lining is Pertex Quantum, a wind-proof, water-repellent, rip-stop wonder fabric that will keep your hand-pillows coming back for more. Thanks to the Borax Mitten, warm hands on a frigid bluebird powder day are common-place.

  • Pertex Quantum shell is waterproof, windproof, and rip-stop.
  • Leather thumbs and Grip Zone on the palm help with pole-grip.
  • Primaloft Lining is synthetic and still effective when wet.
convert to ounces
41g [M]
Weight (pair) 82g [M]
Cuffs Nylon stretch
Screen Touch No
Specs Verified Yes
Materials   Pertex Quantum, leather, Primaloft
Insulation Primaloft
Skimo Co Says
Usage Additive warmth
Notes Finger hole in palm
Bottom Line The overarching overmitt
Compare to other Overgloves

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Questions & Reviews

Alfredo A (used product regularly)
i always keep these in my pack and they work really well! keep my hands warm for skiing down and cold starts. i appreciate the opening in the middle which helps me quickly get my hands out for handling skins.

also, one morning, i forgot my gloves at home and realized the only gloves i had on me were these overmitts. i decided to risk it all and skin up the mountain in 13F weather wearing only these over my bare hands, and lo and behold they were even TOO warm.
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Question from Josh
Does anyone actually like the slit in the palm for being able to use your fingers without taking the mitt off? It seems like reviews mostly say it just makes the mitt less warm.
Answer from jbo
Hi Josh, it can be nice to have your hands nestled in warmth for the down, but then take your fingers out when you heat up on the climb (without fussing with taking your pack off to get/store them). Fiddling with bindings and skins can be nice to have quick dexterity as well.
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Sarah H (used product regularly)
I got these overmitts for the specific purpose of carrying them around and whipping them out when needed. I also nordic, so I'm pretty much hooked on Lill Sport legend slim gloves for all winter activities and attempt to wear them in all conditions/weather so I find myself whipping these overmitts out fairly often (downhills, anytime I take too long on a transition, gloves got wet bc they're not even water resistant). They always warm my hands back up. I'm a size 6 in gloves and the small fits over them easily (not tightly, but in this instance I care more about ease of on/off than dexterity). Cons (I still say 5 stars because they do everything I want them to do, but I'm aware they're imperfect): the palm hole is weird, I don't know what it's four but it is a gap in the warming system. These are pretty bulky, not nearly a down mitt level bulk but you will have limited dexterity when wearing them. Because they're pretty big (despite claiming size small) and with that palm opening, there's really no chance of wearing these alone, they must always be worn over gloves.
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Travis (used product a few times)
I’ve been eyeing these for years and finally got them as a gift from my wife. I wasn’t 100% stoked in the Camp G Comp Warm glove/mitten combo as the fleece glove portion was not very comfortable and left black marks on everything when wet. These are very warm, been using them during our deep freeze (15°, with windchill down to 5°) and they are delightful. I love being able to change the warmth by using a different liner glove and they should work perfectly with a water proof over-mit, Outdoor Research Baker mit being my favorite. I’ll have these in my pack or on my hands almost all winter. Notes - leather thumb, fantastic build quality, and a very stretchy cuff that allows easy access to your watch.
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Question from Hayden
Will you be getting more size L mitts for winter 2021/2022?
Answer from Brett S
Thanks for your question, Hayden! We are slated to get more in stock in the next few weeks. I've signed you up to be notified when they arrive! Please let us know if you have any other questions.
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Nathan H (used product a few times)
Purchased these this winter for back up warmth to wear over liner gloves. My wife has a pair of similar mittens from some other euro company that she raves about so I thought I'd give these a go. The fit and finish is very nice. The opening however stays open and the cold is always seeping in, especially when my hands are clenched or fingers bent i.e. almost always. When I hold my poles the slot folds open so my bare or gloved hands are in contact with the pole grip. So a bit disappointed.
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Question from MARTY
any XS going to be coming in?
Answer from Jeff
Marty, Sorry, Dynafit is out and actually, we never stocked it. Please email us at if you need help choosing an overmitt.
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Question from Andrew
How do these compare in warmth/bulk/etc to these Crazy Idea over-mittens? (

Also if I was a Large in those Crazy Idea over-mittens, what size would you recommend in the Borax? Thanks
Answer from TSB
Hey Andrew, the Borax will be a little warmer and a tad bit bulkier, though not by much. We've also had good luck with the Ski Trab overgloves. You would probably want stay with a Large in either offering.
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Question from josh
Couple questions:

How do these fit with the CAMP G Comp Warm Gloves? Specifically, the fact that the CAMP gloves have the insulating or windproof layer stored behind the wrist, does it get too tight in that area?

Also, is this glove warmer or more insulating than the G Comp Warm?

And last, should we size up to make room for the inner glove?

Answer from Jeff
Josh, I tested out the combo. The cuff of the Borax Overmitt does not extend enough to go over the cuff area of the G comp glove. So it does not interfere there. The Overmitt has all its insulation on the back of the hand so it is warmer there. There are designed to extend the warmth of whatever glove you are you are wearing. Generally you do not need to oversize.
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Question from Ben Sondeen
would these fit over la sportiva skimo gloves? Ive been wearing kinco the last few years and im ready to invest in a better solution, my hands tend to run cold. l love the dexterity of kincos but my hands have been uncomfortably cold too often. thanks!
Answer from Jeff
Ben, I tried the combo for you. The Skimo gloves are insulated and fairly big so do not work well with these Overmitts. These are more designed to go over a light racing glove. The better mitt to fit over bigger gloves would be the Ski Trab Overglove
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Marek Z (used product regularly)
These mittens are in my backpack pretty much through the whole winter season, they weigh close to nothing and make really good backup in case of unexpected cold.
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Model: Borax Overmitt

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